tributes are being paid to the victims of monday night's attack. the suspect, salman abedi, a 22—year—old born in manchester to libyan parents had been known to security services. it is said it is unlikely he was acting alone. the terror threat alert has been raised to critical, its highest level. more rate of taken place across the city today as police continue their investigation. so far, four people have been arrested, one is the suspect‘s older brother. the bbc understands the bomber is thought to have detonated a device built by someone else. the terror threat alert indicates further attacks may be imminent. hundreds of troops have been deployed to protect key sites across the country, including downing street. an off duty female police officer was among the 22 killed in the attack. husband is critically ill and their two children were also injured. we will have all the latest elements in manchester and reaction, but first this report. of those killed in the attack on monday night, more have now been named, including olivia campbell, who was 15 years old. her family have been desperately searching for her, hoping she was still alive. and martyn hett, a pr manager, whose friends described him as wonderful, iconic and beautiful. this afternoon the greater manchester police chief main announcement about one of his officers. very sadly i can confirm that one of the victims is a serving police officer. in respecting their family's wishes i will make no further comment at this stage. the investigation continues at pace and four men have been arrested. the police are confirmed they are investigating a network of extremists. they believe it is very unlikely that abedi was working alone. he was brought up in manchester. he has been described as gullible and someone who turned to religion five years ago. it is nabi discovered he has recently travelled to countries where islamic extremists are based. todayit today it was revealed that dangers we re today it was revealed that dangers were flagged up years ago. the decision was taken to raise the terrorist threat level to critical. this means another attack could be in and. it gives the authorities the power to deploy thousands of troops across the country. some are already in place, guiding downing street, whitehall, and around westminster. whilst we are at critical and there is the possibility of a further attack, we want to be able to support the public as best we can and protect them as best we can, and we believe we need more armed officers on the streets. submitting military colleagues and what i would call static posts in this case, the palace of westminster, allows us to put police officers with firearms in greater numbers across the uk. put police officers with firearms in greater numbers across the ukm manchester while people continue to grieve, there is also determination to remain united as a community. grieve, there is also determination to remain united as a communitym was our darkest hour but also you saw the best of greatest manchester yesterday. i was in the hospital ‘s late last night and i was hearing stories that porters, cleaners, surgeons, nurses, came stories that porters, cleaners, surgeons, nurses, came in off shift to help out. people brought in food. everybody pulled together and we should take a great deal of pride in that, that at our most testing moment greater manchester came together. that sense of community spirit is vital but it will still ta ke spirit is vital but it will still take time for this city to recover from the trauma of what happened here on monday night. we will take you straight to saint anne ‘s square in manchester. thank you. indeed it is a very sunny day in manchester but the atmosphere as you can imagine is solomon and sombre. this is now the focal point of the city's expressions of simply and solidarity. we were in albert square earlier and the tributes have now been moved here. there is of course an important development potentially in our reporting today, and that is the reporting of the possibility, as we understand it, of warnings having been delivered to the police and to the intelligence services as long ago as five years will stop about the extreme and violent abuse which are attributed to salman abedi, the suspected bomber who was responsible for those 22 deaths and many injuries on monday night at the manchester arena. i think it is worth telling you a little more about what we're being told, because we are being told muslim community worker reports members of the public called the police and anti—terrorist hotline warning about the views of abedi several years ago. we understand thatis several years ago. we understand that is five years ago. the community worker who did not want to be identified said that two people who knew abedi at college has made separate calls to the police at that time, they had been worried he was supporting terrorism, that is the quote, and expressed the view that being a suicide bomber was something he considered to be a valid thought. the friends had argued with him, they said, telling him he was wrong, but they have become so concerned that they then came into contact with police. the community worker said all the publicity these days is about muslims not coming forward, and this statement was being made to prove that some had come forward in the past and had expressed their concerns. then the community worker goes on to say, this shows the present policy is a failure. the prevent policy is the official government strategy to counter the radicalisation of especially young people. this community worker says prevent is a failure because it did not work, making lots of moslems feel scared does not work and it did not stop this person being radicalised. that is the information the bbc got this afternoon from a local muslim community worker, reporting that these warnings have been made as long ago as 2012, 2011. more information has been emerging about the suspected bomber. he was 22, born in manchester, his parents we re 22, born in manchester, his parents were libyans, 22, born in manchester, his parents were libya ns, refugees. 22, born in manchester, his parents were libyans, refugees. at one point he was a student at salford university and the fellow students i have just quoted were there at the same time. it is reported he recently travelled to libya, returned to the uk just a few days before the attack. we are also being told by french security officials that it told by french security officials thatitis told by french security officials that it is likely in their view that he did notjust travel to libya but also syria as well. we are not able to confirm that at this point but thatis to confirm that at this point but that is the latest briefing from the french intelligence services. we will talk more about this but clearly, potentially, it is an important development in the way the story is reported. let's have a report from our security correspondent. the face of salman abedi. identified as a manchester city fire bomber. he's now thought to have had helped quite possibly from an expert bomb maker. this amateur footage taken yesterday is believed to show his brother being arrested in manchester. at the family home nearby, police used explosives to gain access and then search for clues. but there are international connections to this plot. from manchester, abedi is believed to have gone to libya, a failed state. and today, the french interior minister said war—torn syria was also a country he'd probably spent time in. increasingly, investigators have been coming round to the conclusion that the bomber, salman abedi, was not working alone. that he was simply the mule, carrying a device designed and built for him by somebody else. now they are talking about him being pa rt now they are talking about him being part of a terror network. m15, the security service, is working with police and other intelligence agencies to try to trace every possible connection he had in this country and abroad. this is what we know about salman abedi. he was born in manchester in 1994 of libyan parents from tripoli. he dropped out of salford university and was already known to security services. in fact, the individual i spoke to yesterday who was a very close friend of the family, described him as a nieve individual. described him as a naive individual. it would indicate he could not have put the explosive belt on. he must have had support helping him do that. meanwhile, the search for clues continues. forensic, digital and testimonies from witnesses and suspects. this, say the police, is a fast moving, wide—ranging investigation. let's talk more about the investigation, wide ranging and fast moving. extensive and now international as well. 0ur correspondent catriona renton is at greater manchester police headquarters. what are you being told they're about the likely direction of this investigation? as you said the investigation? as you said the investigation is moving at quite a pace. let me bring you up to date with what we have learned so far. it appears a crucial question in this investigation may have now been answered. was salman abedi acting alone? the chief constable spoke here earlier today and he said it is very clearly a network that we are investigating. we also know that four men are currently in custody. 0vernight there were three arrests in south manchester, men believed to have links to an address where salman abedi used to live. and yesterday his 23—year—old brother ismail was also arrested. none of these men has been charged. this afternoon police also raided a block of flats near manchester piccadilly station. a controlled explosion was carried out and for a short wail and railway line was closed. they were asked today with a bomb factory had been discovered. the police answered that extensive searches had been carried out. it is crucial now that the police find where this bomb was made, until they find this out they do not know if there are other bombs, other bombers. so they need to find out who made the bomb, did anyone encourage salman abedi to carry out the horrific attack on monday evening? also today police confirmed that an off—duty police officer was among those killed. the bbc understands she was from the cheshire force. her husband is critically ill in hospital and their two children have also been injured. they also said that all the victims's families have been informed of what has happened to them and specialist police are supporting those families of those who sadly died. in terms of keeping the city going, there is a very visible police presence today. we have seen armed police patrolling round here throughout the day. the chief constable has said no military personnel are here in manchester, but what is happening in the army being able to free up officers means things like the manchester games and the manchester ten k can go ahead, trying to keep some semblance of normality in this city while the investigation continues. thank you. let's talk more broadly about the response we have had across all agencies and in government to the attack. joining me now from westminster is the chair of the intelligence and security committee and former attorney general dominic grieve. it is good to have you with us. thinking of the increase of the terror threat level to its maximum, troops being deployed in major cities, can we have your assessment of the way the response has been effected ? of the way the response has been effected? it must be the right response on the basis of the police, and the security services believing there is a network and therefore a possibility of that network launching a fresh attack. so from that point of view the response appears to me to be exactly what i would expect. and when we look at the fact that of course the deployment of troops during an election campaign, for some people, is maybe understandable but also in democratic terms a worrying thing. what are your thoughts on that? they are there to protect the democratic process. if violence is taking place that undermines democracy. and our freedoms. it is important that we should be able to complete this general election peacefully. it certainly does not interfere with campaigning in anyway and when the right moment comes the campaigning will resume. as someone who has chaired the intelligence and security committee what kind of questions would you be asking at this point about the way things are dialling? i think everything i have seen so far suggests that the way the enquiry is being conducted is what i would expect and i appreciate listening to the earlier comments that there are some questions being raised about whether this man came to the attention of the security services earlier. and that is obviously something that will be of interest subsequently in finding out exactly what happened. it is of course very different for the security services if they get such a reference to them, they have to make out an assessment about is this someone who is likely to pose a risk or is actively getting involved in a terrorist network or in some form of planning. so the mere fact that reference is made does not necessarily mean that several years down the line he would have to be a subject of interest. it all has to be inevitably prioritised according the security services view of the greatest risk. we mentioned earlier that one of the brothers of the suspect was arrested in manchester yesterday, and we are being told this afternoon that the younger brother has been arrested in tripoli today on suspicion of links with islamic state. i am wondering for some of your thoughts, cautious thoughts i know, about the libyan context thoughts i know, about the libyan co ntext a nd thoughts i know, about the libyan context and whether that should maybe have been flagged up more prominently in recent years. maybe have been flagged up more prominently in recent yearslj maybe have been flagged up more prominently in recent years. i find that a very difficult question to answer. you have to remember the family were as i understand refugees from gaddafi's libya. admittedly libya is now in a pretty chaotic state but it is no indication of a link to dyche extremism if somebody decides to go back to libya after the fall of gaddafi to visit relatives. the fact he may have gone to syria is another matter, but in itself i would not necessarily infer that because someone has a libyan connection it means they must be linked to terrorism. mr grieve, good of you tojoin linked to terrorism. mr grieve, good of you to join us. it's known that 22 people were killed in the bomb attack, the names of 1a victims have now been revealed. greater manchester police have confirmed one of their off—duty officers is among the dead, although they did not reveal her identity. the bbc understand the officer's husband is critically ill, and their two children are also injured. tributes have been paid to all the victims, including eight—year—old saffie roussos, described by her headteacher as "simply a beautiful little girl in every aspect of the word". lots of these victims of course, their names feature prominently on their names feature prominently on the floral tributes here in the square. just to walk around the tributes is a very moving thing, to see the messages people have left, not just to see the messages people have left, notjust to individuals but expressions of deep affection for the city and the spirit of the city as well. it is a feature of the way the city has come together in the last few days. 0ur correspondentjudith moritz has this report. little saffie roussos had gone with her mum to dance to her pop idol. she became the youngest known victim of the arena attack. the eight—year—old's death has hit her community hard. parents holding their children close and the mound of flowers and tributes at her family's fish and chip shop, continuing to grow. saffie was a pupil at a village primary school in lancashire. her loss has affected parents, pupils and staff who held a minute's silence for her this morning. saffie was simply a beautiful little girl in every aspect of the word. she was loved by everyone, and her warmth and kindness will be remembered fondly. saffie was quiet and unassuming with a creative flair. saffie comes from a close, loving family and we can only imagine what they are going through. the names of those killed keep emerging. the identities of half of the 22 concertgoers who died are now known publicly. amongst them teenagers who had gone to the gig and at least four parents who'd gone to collect their children at the end of the show. greater manchester police say they're now confident they have been able to identify all of those killed, that their families have been contacted and they are being supported by specially trained officers. yesterday, the mother of teenager 0livia campbell was searching for her daughter. today came confirmation that the 15—year—old is amongst those who died. her mum paying tribute to her on facebook. 59 people were injured in the attack. hospitals across manchester are continuing to treat many of them. they are the sort of traumatic injuries you would expect in terms of the type of device used, the proximity to the people who were injured. we are dealing with injuries to major organs, we are dealing with loss of limbs potentially, we are dealing with embedded objects — all the horrific injuries that you would expect from the event that happened. 20 years ago, this church was damaged in the ira bomb attack. today it's just one spot in this city which provides a focal point for grief and a place where strength and solidarity are on show too. judith moritz, bbc news, manchester. judith mentioned the way the medical services have really come together across this region, up to eight hospitals to deal with those injured, some very seriously. our health editor hugh pym is at the manchester royal infirmary. yes, yesterday we heard about how the nhs's plan forjust this sort of incident was put into practice and it worked as well as it could have done. and there has been a reflection on that today from senior doctors and others about how the plan they had did actually deliver what it was supposed to do. but we also heard for the first time from doctors in the two hospitals on this site, part of this trust, who have been handling a lot of the patients who are needing hospital treatment. they spoke for the first time about what they had seen in the early hours of yesterday morning in the two hospitals. here is what they have to say. what has come through our doors is not something exceptional in terms of things we might have seen as a one or two patients presenting after a car accident. it was the volume that was extraordinary. and certainly the separation from family was really ha rd. certainly the separation from family was really hard. for everyone and every level. the families and the staff i think wrestled with that.|j had staff i think wrestled with that.” had a numberof staff i think wrestled with that.” had a number of relatives that were here, but got here before they knew whether relatives were. those relatives and patients were disconnected even though they weren't on the site any more, they we re weren't on the site any more, they were here and they were lost, and it is difficult to manage. it certainly surprised me. it was unanticipated ina way surprised me. it was unanticipated in a way that we would have lost patience. and to see what the relatives were going through was really difficult. two senior doctors talking of the emotional toll felt by nhs staff in the two hospitals over the last day. they made it very clear that as you heard they're treating children whose names they did not know, whose pa rents were whose names they did not know, whose parents were not there, was particularly distressing. we've also had a visit to manchester byjeremy hunt, who paid tribute to staff, including one paramedic who was off duty near the arena, put his uniform on and went straight there. two doctors who went there to triage victims without any thought for their own personal safety. thank you. the government has announced in the last few minutes that there will bea the last few minutes that there will be a nationwide minute silence. 0ur political correspondent laila nathoo is at westminster. that is right. we havejust that is right. we have just heard that is right. we havejust heard on the last few and it is about this minute's silence at 11am tomorrow. the government says flags will continue to fly at half—mast and all whitehall government buildings. we have heard this afternoon about what the parties intend to do about the general election campaign. the conservatives said that after this minute's silence they will start a local campaigning and their national campaign will resume on friday. labour said they will also resume local campaigns tomorrow and the national campaign on friday. the liberal democrats are also considering whether to resume on friday, so i think we can expect campaigning, perhaps with a muted tone, but to get back this week. thank you. you watching bbc news, here in manchester. dr sajjan gohel has advised the government on security operations, and is the international security director at the asia—pacific foundation, a think—tank which provides analysis on a variety of global security issues. hejoins me now from central london. thank you forjoining us. what are your thoughts on today's developments, and if you can comment on the news we have been reporting that there may well have been some warnings about this man, maybe five yea rs warnings about this man, maybe five years ago? what is important today is the fact that the chief constable of greater manchester police has confirmed that there is a network involved, that salman abedi wasn't necessarily acting on his own. this now draws similarities to the networks that existed in france and belgium where there were some people that were being recruited, sometimes physically, sometimes through the virtual world, and it is important to ascertain just how big the network is, who are those individuals, what are their skills, are they trying to groom and recruit other individuals? as regards abedi himself, it is not surprising that he came on the radar. 0ften individuals are picked up based on comments they have made or complaints made about them, but the thing is that the burden of proof has to be at a level where the individual can then be prosecuted. if not, the authorities then have to make the difficult decision about do they continue to monitor him, or do they continue to monitor him, or do they use resources to look at someone else? can i ask you about the fact that we are talking about a libyan context, the parents were from libya, as we are reporting today that the younger rather has been arrested in tripoli and is the older brother arrested in manchester. this libyan context, for you, given the state of libya and the fact that we have been talking about the extreme radicalisation of parts of libya for some years, what are your thoughts on that and how it affects the way we consider what has happened here? the libyan angle has to be looked at and explored. we know that isis has a presence in some parts of the country, they at one time controlled significant territorial in the north eastern pa rt territorial in the north eastern part of libya it self. the issue needs to be looked at because increasingly there is concern, especially from southern european countries, that they are experiencing essential foreign terrorist fighters from libya and tunisia trying to come into their countries, like in italy, the maltese have complained that they could be a threat from libya. that is something the authorities need to investigate. it is a reminder that it does not always come directly from syria and iraq. isis has tentacles from syria and iraq. isis has te nta cles in from syria and iraq. isis has tentacles in other parts of the world and we need to be careful, whether this is isis or not, though they have claimed responsibility. it is important for the authorities and the police to continue their investigations as well as they have been doing. on that point, i am being told the police have just arrested a fifth person in wigan in the past half—hour. clearly they are making progress in some areas. some thoughts from you and the kind of wider response we have had within the uk, in terms of deployment of troops on the streets, a prominent points, and the fact that the threat level is now at its maximum level. how do you assess the way the response has developed ? how do you assess the way the response has developed? the fact that the threat level has been raised to its maximum is important, it is also because of the fact that if there is a network out that the authorities don't want to take any risks that are potential follow—up activity could take place. by increasing the threat level the aim is to free up resources for the police so they can conduct their investigations and so the military can guard certain sensitive sites. we should also point out that there are very we should also point out that there are very capable officers in greater manchester police and also the north—west counterterrorism unit that are investigating this. i know some of them, how capable they are, and they will piece this together. we just need to be patient and give them time. i know it is a challenging situation, especially after the atrocity that took place, and with all those young children that died, but this is unfortunately now the type of threat that we are facing. the authorities have disrupted so many plots, it is a problem that sometimes one may be successful, especially if it is a small cell, one individual, it is the old arab adage that the authorities have to be lucky all the time, the terrorists just be lucky once. some final thoughts on the fa ct once. some final thoughts on the fact that there is tension between the intelligence agencies here and in the states, because there has been some information coming from the united states which clearly the united kingdom did not really want released. your thoughts and how effective these national cooperation is right now? the corporation between the uk and the united states is intrinsic. they form a union with canada and australia raced in cooperation and sharing, also france and germany. it's on a different level. it's important that information doesn't lea k important that information doesn't leak prematurely because the police may have issues when they are trying to conduct an operation when trying to conduct an operation when trying to see if a suspect is related to the manchester plot. it could result in the police operation is being undermined. just underline the news i have shared that there has been a bit arrest and that has taken place in wigan. i'm told that has been taking place in the last half—hour and we will have more details on that shortly. we are insolent and's square in manchester. a vigil is taking place. —— we are innocent and's square. —— st anne's square. there are people who have been really damaged and we are trying to put a message of hope and healing, and keeping resilient, that northern ripped. grit. my message throughout my professional and personal life is that we must overcome our personal differences. the purpose of division is cohesion. we need to engage. 0ut of all the tragedy, there has been an outpouring of love and i feel proud to be part of this community. you are proud to have been part of the prevent project, tried to prevent radicalisation in some areas. do you think people are writing question the validity of that given the circumstances?” writing question the validity of that given the circumstances? i had been supporting it, why? because it is setting out to prevent terrorism. how could anyone not be supportive of that, which is why support it categorically. had there been issues? i've been out on the road all day. if there have been mistakes that have been missed, or things that have been missed, or things that should have been picked up, thenl that should have been picked up, then i were one will be asked those very ha rd then i were one will be asked those very hard questions. but as an objective, i don't think anyone can argue with the safeguarding objective. a muslim community worker has said to the bbc to say that it is not fair to say we don't speak up and in the case of this man, concerns were raised according to this worker five years ago so what will be made at that?” this worker five years ago so what will be made at that? i share those sentiments but i don't have the details. i said we need to be more clear and open and this is —— if this is what a worker has saved them that will be looked at. —— has said, thenit that will be looked at. —— has said, then it will be looked at. u nfortu nately, then it will be looked at. unfortunately, it is an evil... it doesn't seem that anyone is immune to it which is why the confidence in the community... i've come out here to see two people, muslims, say you are loud and proud muslims, to other communities, there is nothing for us to be fearful of. we are an integrated part of society and we are very integrated part of society and we are very proud of that. you have key points in your life and for me this has been a real privilege and honour to speak here. thank you. that is the chief aim arm from the local manchester central mosque. it is perhaps difficult to think of two more different people and today president donald trump met pope francis at the vatican for a short private audience on the third leg migration and climate change. james reynolds reports from rome. a warning, his report contains flash photography. no one rushes to meet the pope. president trump was escorted slowly through the back corridors and into the pope's office. this is the first time these two leaders, opposites in every way, have met. such an honour, the president said. the pope rarely smiles during this kind of photocall. they begin their conversation. the president who wa nts to conversation. the president who wants to build a border wall sat across from the pope who says he wa nts to across from the pope who says he wants to build bridges. do you feed him servini and cakes, the pope joked to mrs trump. they wore black veils. the two leaders then exchanged gifts. the pope gave the president some of his writings including his appeal for environmental protection. well, i will be reading them, the president said, politely. francis will hope so. it's harder to imagine a meeting between two more contrasting leaders. the pope opposes donald trump and border walls, climate and immigration. this was a chance to see if each man would give ground. the president and his wife were left to admire the sistine chapel. the leader, with his own noted tasting expensive decor, looked impressed. bbc news, rome. marks & spencer has seen its profits plummeting. this was blamed on the cost of opening new food stores. emma simpson reports. no excuses, it's part of the new campaign and the bosses and holding back either. international stores like this are closing along with some uk shops. the final salary pension scheme is going. just some of the things putting a dent in profits. we need a business that is fit for the future. we need to get this right for and multichannel customer. they are more digitally savvy and that means less stores and fewer, bigger stores with better experiences for customers in the uk. he's trying to wean them off promotions and discounts, trying to get stuck by more staff at full price. although clothing sales were positive christmas they have fallen backin positive christmas they have fallen back in the last few months so is this strategy working? they've done well to cut back on the number of sales and get shoppers to buy full price items so that has helped in the short term, but in the longer term, the core issue will be that clothing sales are in decline and they are stuck in the middle. playing the middle ground, not the cheapest and not the most fashionable. the marks & spencer 's boss knows he needs to get clothing right but the trouble is we don't wa nt to right but the trouble is we don't want to spend as much on as we once did. more on experiences, leisure and activity holidays. what it means is that in areas like clothing, tensions are reduced, and the clothing market for the first time in years fell by almost 2%. we need to make sure we did right things for our customer. it sounds easy, but turning round women's fashions is going to get even tougher. the driver of a lorry involved in a crash on the m6 has been arrested over dangerous driving. the crash happened in the early hours of this morning. 0ne happened in the early hours of this morning. one person was also critically injured. the police say the stretch of motorway will be closed for some time. now let's go back to christian fraser in manchester. rita, thank you very much. we are still at the cordon and plenty of police activity continuing throughout the day. they are still going through forensic work, all so forensic raids around the city today. we have heard in the last few minutes that there has been a fifth arrest in wigan. let's go to katrina renton at greater manchester police headquarters. what can you tell us about this latest arrest in wigan? there has been a fifth arrest according to police in connection with this investigation. we understand that a man was arrested in wigan this afternoon in connection with that horrific incident that happens in manchester on monday night. a man was carrying a package which is currently being assessed by police. there were three arrests overnight, following raids. there were links to an address to where the bomber originally lived, and we understand his brother has been arrested. the 23—year—old arrested yesterday was also his brother. his younger brother, the younger brother of salman abedi has been arrested in libya. he is being held in tripoli. thank you, katrina renton. there's a lot of forensic work going on here in the arena in the 48 area. —— in the foyer area. they are collecting the foyer area. they are collecting the fragments. we've heard from frank gardener, al security correspondent, we think that salman abedi was only the mule. we now speak to a former counterterror officer who worked for the met police in the 7/7 bombings in 2005. there was work done on the bombs used in 2005. what did you learn from that and how may be similar to the event here in manchester? we learned in 2005 was that the explosive devices were used using fairly innocuous substances. they we re fairly innocuous substances. they were made out of hydrogen or oxide. we diagnose the component form of this bomb, and it's quite important that police find out what that is. we wa nt that police find out what that is. we want to find out where the items we re we want to find out where the items were purchased, the component parts, in order to move investigations forward. we will be looking at cctv at the places where these items were purchased. we need to understand the composition of the bomber and how it was put together. it might not be particularly sophisticated, this bomb? 0rdo you particularly sophisticated, this bomb? or do you need a certain amount of sophistication to prepare it and make it go off in the way in which it was designed? you need the correct chain reaction in order to make it go off. fairly crude devices, you can make them from fireworks, but what we are looking at in this case is a different level to that. it was able to kill the number of people that it has and it was more sophisticated and in order to manufacture it, police will be looking for a bomb factory, and then being able to transport a volatile device from one place to another without it going off and then making it go off at will at the target, it's a whole different ball game than just putting a match to it. it's a whole different ball game thanjust putting a match to itm may explain the threat level reaching critical. regarding the terror threat in france, that is at its highest level and it has made no difference. is the prime minister right that this is a proportionate response and does it make any difference to what might happen?” think the difference between here and france is the critical level, the highest, has enabled the prime minister to put troops in place where we had armed police officers, downing street and the palace, some embassies. it's enables police to be redeployed by putting the army there, so if intelligence is found then officers that are trained to deal with these things, they can be neutralised on the street, it gives them more options. we have been saying today that two brothers have been picked up. one in libya, won here in manchester. 1 been picked up. one in libya, won here in manchester. i suppose like any other investigation, you start with the family first and move outwards? i'm guessing that the police are moving forward their investigation. they turned up at a number of addresses, found some people there and they don't know whether what they are being told is correct. they have two investigate and it doesn't mean that the person is automatically guilty. but the best way to question someone is at a police station. they don't know what they are going to find at the address. they are taking things out, slowly, methodically. they will know whether there is any evidence against the people they are arresting, or not. thank you, david, for being with us. a couple of lines to bring you about security. we've heard that chelsea's parade on sunday, that has been cancelled, the parade of the trophy because of the terror threat that has been increased. the focus will shift tonight to the football in stockholm. manchester united are playing. thousands of fans have gone over there. the players will wear black armbands were may take to the field? that's right. this is a chance for football to pay respects. the entertainment inside the venue has been toned down and the atmosphere has been more muted than we expect from an occasion like this. yes, the united fans have been enjoying themselves in the bars and cafes, but there has not been that celebratory atmosphere that you get isa celebratory atmosphere that you get is a major european final. i've been talking to a lot of fans who have been saying that no people had been personally affected by what has happened and they want to do their city proud here tonight, as well. andy, thank you very much. i am sorry. we are having a few technical issues there. the youngest victim of the attack, saffie roussos has had her school paying tribute to her. her death has come as a shock to us all. we wished to send our deepest condolences to her friend and family. she was a beautiful little girl in every aspect of the word. she was loved by everyone and her warmth and kindness will be remembered by everyone. she was warm and unassuming, which creative flair. she comes from a close—knit family and we can't imagine what they are going through. it is hard enough for adults, let alone children to understand the randomness of this terrible act. 0ur job now is to help families deal with the after—effects of this traumatic experience. we are being supported by lancashire county council. today, we came together in our hall as a school community. we have held a minutes silence in her memory. we sang don't stop believing. as you can imagine, there we re believing. as you can imagine, there were tears from the children and the staff, but we know we have to hold onto the love amongst us. we owe that to her and herfamily. we asked the press to give space to her family and friends in order that they can grieve. let's go straight back to manchester and christian. apologies, we were moving the camera because the ring fenced area has now been removed. you can see the police and people starting to file down the road, under the railway bridge. then starting to get back to normal, but as you have heard from david, who we we re as you have heard from david, who we were interviewing earlier, a lot of people are in the boyet area, crucial to the investigation. —— boyer it won't get back to normality any time soon for those in the arena. then there are those who were involved. how do they come to terms with what they saw and experienced we now go to a school in manchester where people are trying to help children come to terms with terrorism. good morning, everyone. has everyone heard the news? yeah. it is the start of the school day. and for these primary—school children in south manchester, there is a change to normal lessons. these 11—year—old pupils have been given the chance to talk about what happened at the manchester arena. all over the uk, teachers are trying to explain to their students what happened on monday night. many schools in manchester have been offered extra counselling to help children over the next few days. i was quite scared because, like, it would happen even more closer to us. i was quite scared because, like, it would happen even more closer to us. i always speak to an adult about any worries i have, mainly my mother. but maybe if she is not available and it is late at night, i have a teddy bear that sits at the end of my bed. it makes me feel a lot better. i talk to my dad and he said it would be all right and police officers would investigate and everyone is helpful. how do you feel about what you have heard this morning? for teachers, sharing this news is never easy, but they said they are reassuring the children as much as they can. all of these children involved, it makes it even more difficult for children to understand, and it makes it even more important for us to talk about it to reassure them and help them feel safe, because, you know, lots of them go to the manchester arena and see concerts. it is somewhere they would go so it becomes really real for them. anthony ticked son, lewis, to his first answer. i think it is really nice that people in such horrific events can show such positivity. it's at times like this that children show us how resilient they can be. if you were with us earlier, you would have heard us talking about a fifth arrest. it's an arrest in wigan. we've got some footage of that. a man is being taken to the ground by police and confirming what katrina renton is saying, there is a red bag which was of some interest to police as he was being taken off the bus. the special deterrent force in tripoli has taken in another one of salman abedi's brothers. two brothers are being interviewed as pa rt brothers are being interviewed as part of that widening investigation. that is it from me for the moment. george will be here with your news inafew george will be here with your news in a few minutes time but let's get to catch up now with the weather. today has been the warmest day of the year so far, 26 celsius. a little bit over that in the south—east of england. you can see the stench of the sunshine. most of the stench of the sunshine. most of the cloud has been in the north and west of scotland. retreating northwards towards the northern isles. a warm night. quite muddy out there. 14—15dc. ithink isles. a warm night. quite muddy out there. 14—15dc. i think we will see less and less of that coastal fog as we head into the afternoon. a little bit of fairweather cloud. blue skies across the whole of the uk. warmer today by good couple of degrees. 28 is possible in the south—east of england. sunny and warm on friday, temperatures close to 30 degrees in scotland's. warm in central and eastern england. tonight at six from manchester, the concert suicide bomber was known to security services and police believe he was part of a wider network. salman abedi, who killed 22 people, had recently come back to britain from libya. police believe he was not acting alone. it's very clear that this is a network that we're investigating. as i said, it continues at a pace. there's extensive investigations going on. four more people have been arrested. police are still searching a city centre address. condemnation for monday's atrocity comes from across the community. this act of cowardice has no place in our religion, or any religion for that matter. more of the victims are being named, lives cut short —