It triggers the deployment of troops to key public locations. Also on The Programme tonight President Trump goes to the vatican to see the pope. Its their first face to face meeting. Donald trump calls it the honour of a lifetime and vows to use his presidency to promote peace. Five people travelling in the same car are killed in a collision with a lorry on the m6 motorway in staffordshire. And taking a plunge the high street giant Marks Spencer sees its profits drop by two thirds. Coming up in sportsday later on bbc news, manchester are united in sweden. We look ahead to what will be an emotional Europa League final against ajax in stockholm. Good evening from manchester. Were in st anns square, which has become the focal point for the citys tributes following mondays Terror Attack. Let me give you an idea of some of the things people are writing and saying. This t shirt says, to all who lost their lives, Evil Will Never beat manchester. We will stand together, god bless. Another one talks about rip manchesters angels. Thats a phrase we have come to know. And over there, hashtag we stand together. How many times have we seen that on social media over the last couple of days. So as the people of manchester come to terms with whats happened, a clearer picture is emerging of the man responsible for mondays atrocity which left 22 people dead and dozens more injured 20 of them in a critical condition. Today, Police Confirmed they were investigating a Terror Network following the attack by 22 year old salman abedi. He was known to the Security Services albeit up to a point, according to the Home Secretary. Because of fears of a Wider Network connected to abedi, the threat level across britain has been raised to its highest critical. It means troops have been deployed to key locations across the country. Four more people have been arrested that follows the arrest of the bombers brother yesterday. Tonight, well bring you reports on the investigation, the bomber, and the victims but first, heres our chief correspondent gavin hewitt with the latest on the concert attack. Late morning, central manchester, and a raid on a block of flats, part ofa and a raid on a block of flats, part of a huge operation to discover the network of the manchester bomber. The operation involved armed units, some wearing military clothing. Their target, a flat recently rented out. Got the front door and was greeted by an armed Police Officer with a machine gun. I asked greeted by an armed Police Officer with a machine gun. Iasked him greeted by an armed Police Officer with a machine gun. I asked him what was happening. He just with a machine gun. I asked him what was happening. Hejust said out with a machine gun. I asked him what was happening. He just said out to gain access to the apartments, they blew down a door. Other police units arrived looking for any signs of a bomb factory. There have been raids in different parts of the city, this one involving armed units. The police regard themselves as in a race against time, trying to find other members of the network to prevent further attacks. This was just one of the number of Police Operations carried out in manchester today. You will be aware that the level of activity in this investigation is intense and is continuing at a fast pace. Its clear that this is a network that we are investigating. It continues at a pace. The uk is now a country on high alert. This was reading this morning. And this was the Scottish Parliament in edinburgh. Outside downing street, soldiers were patrolling alongside police. Eventually, 3800 troops will be deployed. Elsewhere, the changing of the guard at Buckingham Palace was cancelled, a nation living with the expectation of an imminent attack. We have now gone to a critical level in terms of the threat. Operation temperer has now been invoked, and that means there will be additional Military Personnel coming to backfill the armed Police Officers so backfill the armed Police Officers so that they can support other areas. All of the Special Operations areas. All of the Special Operations are aimed at discovering the circle linked to salman abedi mother manchester bomber. It has become clear that he was part of a terror cell. Police today were examining his house in south manchester. Abedi may have been a mule, the bomb carrier, but bomb makers may still be outlawed. Abedi returned to the uk from libya a few before the attack. Today, abedis younger brother was arrested in libya on suspicion of links with the so called Islamic State. His father had posted this picture and called him a line in training. Abedi worshipped at the Didsbury Mosque. One of the trustees today condemned mondays attack, although he didnt ta ke mondays attack, although he didnt take any questions. The horrific atrocity that occurred in manchester On Monday Night has shocked us all. It has indeed shocked us all. This act of cowardice has no place in our religion, or any other religion for that matter. On monday night, salman abedi carried out a Suicide Attack at the Manchester Arena. 22 people we re at the Manchester Arena. 22 people were killed and 59 injured. These are some of the 22 people who were killed in the attack. Only say they are supporting their families. The youngest was just eight years old. Also killed, a polish couple from york and a serving off duty Police Officer. All day in manchester, people have been coming to the town hall to lay flowers and to remember. Just pain, because everybody in manchester seems to know somebody that attended. My daughter had a friend that went. It is like we are all linked together. It is like it happened to someone in your own family. I brought my red, white and blue rose down and just wrote some words. I felt like i blue rose down and just wrote some words. Ifelt like i had to come. That was the mood here, defiance, but they need to show and share hurt. There is nothing any of us can really do from this end, but you wa nt to really do from this end, but you want to do something, even if its just a few flowers to say we care. Thats something. Tonight, manchester is a city that knows there may be people in its midst who have planned mass murder and may strike again. Gavin hewitt, bbc news, manchester. Key to the investigation is building up as clear a picture as possible of the bomber, salman abedi, and his background. He was born in britain to libyan parents who had fled their country. We know he went to school in manchester, but dropped out of university in salford. We also know abedi travelled to libya, but returned just days before the attack. Our special correspondent, ed thomas, has spent the day in south manchester, where salman abedi grew up. Suicide bomber salman abedi, an extremist who attacked the city of his birth. Now investigators surround his home. Like everyone here, they want answers. This man knew abedi. He had watched him come and go from manchester to libya. Now he cant believe what his neighbour did. Unbelievably disgusting, to be honest. Especially for a muslim. And a libyan as well. To us, obeying the law of the country is the most priority number one. That is what the prophet teaches us. Some talk of erratic behaviour, of Abedi Chanting in the street. He was shouting in arabic. The bbc has been told a black flag with islamic writing hung outside his home. Many had no idea what it meant. I saw some sort of like outside. With islamic writing on it . Was an english writing . No. A Community Worker who didnt want to go on camera has told us that two several people who Knew Salman Abedi at college when police several years ago. They said he was supporting terrorism and had expressed a view that being a Suicide Bomber was ok. Greater Manchester Police will not comment on those claims. And what about the manchester bombers family . Is his brother, now under arrest in libya for supporting so called Islamic State. This is abedis father, affiliated to extremists. The Libyan Islamic fighting group is now back home in libya. On his facebook page, he praises alqaeda fighters in syria. Before he left south manchester, we are told he would take part in present this mosque. He is there all the time when the prez are happening. Heres a guy who announces. Police now want to know if anyone else knew What Salman Abedi and his father believed. He was well known in the mosque . Abedi and his father believed. He was wellknown in the mosque . Oh, yeah. A good man . He is a good man. This man is close to the trustees at Didsbury Mosque. Like many, he had no idea of the familys extremist links. We know he is connected to Extremist Fighters in libya, groups close to alanda. Extremist fighters in libya, groups close to alqaeda. Right. Is that a problem, though . People like yourself, good people, dont know who they are with . The Mosque Trustees have to do more about that. Leaders of communities have to sit together. Tonight, Didsbury Mosque said salman abedi was a coward whose crime had no place in their religion, a man willing to kill and hurt in the city that was once his home. Ed thomas, bbc news, south manchester. In a moment, well speak to our correspondent Quentin Somerville in libya, but first lets go to our security correspondent gordon corera, whos outside mi5 headquarters. They are talking about a network. I guess that is the focus of the investigation . Absolutely. The intensity and pace of this investigation has not lessened, because in the last 2a hours, confidence has been increasing that salman abedi did not act alone. As we have heard, he was most likely pa rt we have heard, he was most likely part of a network. In particular, the concern is that he may not have built that relatively sophisticated explosive device himself. That means a bomb maker could potentially still be at large, and so could other explosive devices. That of course is why the threat level has gone to critical. Here at mi5, they are aware that there may be questions asked at some point about what they knew about him. Certainly, the Home Secretary has said salman abedi was known to the authorities, and the bbc has learned that a number of people reported him to the police because of concerns about his behaviour. So there may be questions in the future about what they knew about him and when. But the focus at the moment is on the investigation and understanding what kind of network there was in the uk what still exists and also his travel overseas. Lets go now to Quentin Somerville in libya. An arrest in libya what more can you tell us . Im afraid we cant bring you Quentin Somerville. We have lost that link to him. But i can tell you that link to him. But i can tell you that in the last hour, we have had some pictures of a 50 uk arrest a fifth arrest in the uk. This happened in wigan in connection with the Terror Attack on monday. I am told that the police there are examining a package that the man was arrested was carrying. That has come in since we have been on air. So far, 14 of the 22 victims of mondays Suicide Bombing have been identified, some of them children. They include 15 year old olivia campbell, whose mother posted a desperate plea on facebook for information about her daughter. We learned today that an off duty policewoman was among those killed. All of them had gone to the Manchester Arena for what should have been an evening of joy and fun. Our special correspondent allan little has been finding out more about some of the victims. As their names emerged today, one thing was inescapable. The extreme youth of so many. There is a special anguish in this. The carefree tenderness of the lives lost. Olivia campbell from bury was 15. Her family spent yesterday frantically searching for her. They learned early today that she had died. Her mother, charlotte, posted this message on facebook. Saffie roussos was eight. She went to tarlton Community Primary school in lancashire. This morning, her classmates at assembly sang, dont stop believing. Her mother and sister are still in hospital. She was loved by everyone. 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 theyre going through. Marcin and Angelika Klis from poland lived in york. This photograph was taken shortly before the attack. They had come to collect their daughters from the concert. Their girls lost both parents in an instant. Ive been a Deirdre Barlow super fan. Shes always been my favourite character. This is martyn hett speaking to the bbc in 2015. He was 29, gregarious, full of enthusiasm. His partner wrote, our wonderful, iconic and beautiful martin didnt martin didnt survive he left this world factory how he lived, centre of attention. Kelly brewster was 32 and from sheffield. She died shielding her 11 year old niece from the blast. Her partner wrote, kelly really was the happiest shed ever been. We had so many things planned together. Georgina callander had adored Ariana Grande since childhood and had met her. She was 18 and a second year children of health and social care, planning a career committed to helping others. John atkinson, who was 28 and from bury, also studied health and social care. One in a million, his friends said. Loved by so many. A true gentleman. Jane tweddle taylor was a School Receptionist and a mother of three from blackpool. She was waiting for a friends daughter. She is irreplaceable, her colleagues said, bubbly, kind, welcoming, funny, generous. Neljones was 14 and described by her teachers as a bright and popular pupil, always smiling. It feels like the school has lost a sister, they said, not a classmate. Sorrell was also 14 and from leeds. Her mother and grandmother were injured, her grandmother critically. Her sister survived without injury. Miohelle was married with three young children. Herfamily issued a statement saying, family was her life, she has been taken from us in the most traumatic way imaginable. Friends lisa lees and alison howe were waiting for their 15 year old daughters. Both girls survived the blast but their mothers died side by side. Look into these faces and youth and optimism beam back at you. Children, young parents, leading normal, blameless lives. Alan little, bbc news. Well, as we heard, alison howe and lisa lees were among those killed in the attack at the Manchester Arena. Our correspondent, judith moritz, has been to their home town of oldham, to speak to their friends in the community there. Lisa lees and alison howe. Mums, friends, and a real part of this community. Today would have been alisons birthday. She grew up here with schoolmates who became soul mates, after 30 years of friendship. She was just the best one out of us all. She just kept us all grounded. She was just amazing. She was our forever friend. It must be very hard to take in this. It doesnt seem real yet. It has not sunk in. She was very selfless. Did everything for us. Anyone who knows us knows all of us, and they all know us as a team, and we are always together, and the loss of alison, without a shadow of a doubt, has broken all of us. Lisa and alison had gone to collect their daughters from the concert. They were caught in the blast before they could reach their children. I know lisa a long time. She used to work ina i know lisa a long time. She used to work in a shop next to me first i know her daughter, lauren, as well. Lauren came to my shop over the weekend. She showed me her tummy, she was expecting a baby. It is just so sad. Lisa and alison were loved here and their loss will be felt by so many in this town. Treatment councillors have been brought in to help those who need it. At the town hall, people who knew the ladies are plenty who did not queued up to sign a book of condolence. What is evidence is there is a need here today and that is why we are here, today and that is why we are here, to recognise that need and play our part, and to share the pain and grief. Today, teenagers cried for the loss of their friends mums and mothers wept as well, as all of this town ta kes mothers wept as well, as all of this town takes in just what it has lost. One of the key questions in the aftermath of mondays atrocity is to find out how the Suicide Bomber, salman abedi, came to adopt his extremist views. Remember, he was born and raised here in britain, spending much of his life in the very city in which he has caused so much suffering. Our home editor, mark easton, looks at whether the threat of a future attack could be reduced. In the streets of south manchester, condemnation of mondays tag is total. From this area more than a dozen men have been identified as having been radicalised and then followed the path of extremism. Salman obeid ee isjust the most recent. What screams at you at times like this is how we stop young people from being radicalised in the first place. The governments answer is prevent. It requires Public Workers and others in the community to report any possible signs of extremism to police. In the market, i met extremism to police. In the market, imeta extremism to police. In the market, i met a stallholder who told me he was acquitted of terrorism charges four years ago. His opinion of the prevent strategy is not unusual. From my case, when i was accused of being a terrorist, they said extremism is practising yourface. You are accused of being a terrorist. I went on trial for four months. I was told if you are praying five times a day, that is the first step in extremism. Prevent, to you, is quite personal and has had a big impact in your life. When it is targeting innocent people, yes. No one agrees with extremism or terrorism but when you are discriminating against a section of people who have lived in peace for many years, i think that is extremely racist and terrorism itself. It has now emerged that some in the community had called the Police Anti Terrorism hotline trying to alert the authorities to the radicalisation of salman abedi. It was not enough of that sum in the market do not think that makes the policy of failure. It is very bad for the community. Some people think it is buying on your own community. No. I dont think so. If you are right, it does not matter. The new mayor of greater manchester, andy burnham, campaign to scrap prevent, claiming it was toxic. He now oversees the strategy across the region but today refused to discuss it, saying it was not the time. This muslim mother has no such qualms. She has written about extremism and thinks the current policies are not being properly explained. Prevent has a branding problem. Absolutely. Iama has a branding problem. Absolutely. I am a supporter of it. I am critical of it full stop it has flaws. How can anybody with a sane mind and intellect be against that . Politicians reference prevent as how they are working with the muslim community. Others, as proof of their toughness in targeting islamic extremism. Such mixed messages may be the policys eight is challenged. All this is happening in the middle ofan all this is happening in the middle of an election. Our Political Correspondent ben wright is in westminster, when will Election Campaigning start ain . When will Election Campaigning start again . Hours after the attack, and ate all the Political Parties suspended their campaigns. There have been no rallies or speeches. Slowly that will end. Ukip is launching its election manifesto tomorrow that they have delayed it for a day but the leader said it was important that the Democratic Process continued. This afternoon, Jeremy Corbyn spoke to theresa may saying he worried any further delay to the beginning of the campaign into the weekend risks undermining the Democratic Process. Labour will begin campaigning locally tomorrow and then nationally from friday and the conservatives will do the same. I expect the snp and lib dems will follow suit. The campaign will get going again although i feel it will be different. It will be more restrained and subdued. Before any of that happens, there will be a minutes islands across the uk at 11 oclock tomorrow to honour those who died and remember Everybody Else who has been affected by the attack. Iam being i am being told we have re established that line to Quentin Somerville in libya. We heard earlier in The Programme there has been an arrest in libya. I wonder if you can give us the latest. George, in fact there have been two arrests. The father of salman abedi and his younger brother. Both were arrested here in libya. Well soon know that salman abedi has travelled to the country many times. The country he was travelling too was one that has been collapsing under its own civil war but also in the midst of a fight against extremism, both the so called Islamic State and alqaeda. Something like three and a half thousand libya ns alqaeda. Something like three and a half thousand libyans left here after the battle and travelled to syria. Then those fighters, many of whom joined the Islamic State in syria, started coming home. They have since been driven out of their seven base that is what this southern base but they are still incredibly active. That Big Question Of Whether Salman Abedi was part of a Wider Network, there were plenty of goals that would open out into the network of extremism here in libya. Thank you very much. Just to say that the bbcs Question Time will be coming from salford tomorrow night to reflect on the attack in manchester. If youd like to join the studio audience, you can apply via the Programme Website bbc. Co. Uk questiontime. We will be bagged a little later in The Programme. Now, lets go to sophie in london. Our top story this Evening Police in manchester said they believe the Suicide Bomber, salman abedi, who killed and injured people was part of a network. And still to come taking a plunge. Why have Marks Spencers profits plummeted . Coming up in the sport later on bbc news. Sport pays its respects to manchester. A minutes violence before the one Day International at headingley. Silence. President trump has vowed to use his presidency to promote peace after meeting Pope Francis For The First Time at the vatican. Donald trump described their talks as inspirational and said meeting the pope had been the honour of a lifetime. The two men have clashed in the past over issues such as climate change, migration and building a wall on the us mexico border. From the vatican, heres our north america editor, jon sopel. Ever so slowly, and flanked by the swiss guard, the leader of the worlds pre eminent superpower walked through the vatican to meet the leader of one of the worlds pre eminent religions. And were there ever two more different people . Pope francis, with just the merest hint of a smile. President trump, beaming. They sat across from each other in the pontiffs study, as if one was going for a job interview. But there were lighter moments as Melania Trump was presented, the pope wanted to know, do you feed him lots of potica . A slovenian cake. Her Facial Expression suggested she hadnt expected that as a question. The president gave the pope bound copies of the works of Martin Luther king. The pope gave the president some of his encyclicals, including, pointedly, one on the environment and the dangers of global warming. After two World Leaders have had a difficult discussion their normal mantra is there is more that unites us than divides us. That may well be true but make no mistake the divisions between the pope and President Trump are significant. During the election campaign, when pope francis visited the us mexico border, he said that people who choose to build walls are not bridges were not christian. He actually said that maybe im not a good christian, or something its unbelievable donald trump said those comments were disgraceful. And in february, just after donald trump had tried to introduce his travel ban from six mainly muslim countries and suspended the refugee programme, the pope tweeted, how often in the bible the lord asks us to welcome migrants and foreigners, reminding us that we too are foreigners the visit concluded with a tour of the sistine chapel, and the awe inspiring lastjudgment by michelangelo. The vatican said the discussions had been cordial, a connection has been made. Five people have died in a crash involving a lorry and a car on the m6 in staffordshire. Four women and a man who were all in the car died in the accident which happened between Stoke On Trent and stafford in the early hours of this morning. The lorry drivers been arrested on suspicion of causing death by dangerous driving. Liz copper reports. The crash was on the southbound stretch of the m6 between Stoke On Trent and stafford. The Emergency Services were called just after 4 30 in the morning. Four women and a man travelling in the car a nissan micra were killed, while another man in his 40s was taken to hospital with serious injuries. We are still in the very early stages of the investigation