The identities of everyone who was killed. Tonight in st anns square in the heart of manchester, more tributes are being left for the victims, their families and friends. And in Tonights Europa League final, a minutes silence led by the players of Manchester United. Also on tonights programme, 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. And coming up later in the hour on sportsday on bbc news, well have the latest reports, results and features from the bbc sports centre. Good evening from manchester, where police have confirmed theyre investigating a network of people in connection with the bombing at a Concert On Monday Night in which 22 people were killed including children and young people and dozens injured. More of the victims have been named during the day, and more details have emerged about the Suicide Bomber, 22 year old salman abedi, and his links with libya. Here in manchester, police have conducted more raids and theyve now arrested six people. And troops have been deployed on The Streets Of London following the decision to raise the Terror Threat level to critical, the highest category. Well have all the latest developments, and we start with our chief correspondent gavin hewitt, who reports on the investigation into the concert attack. Late morning, Central Manchester, and a raid on a block of flats, part of a huge operation to discover the network of the manchester bomber. Police believe he stayed there as recently as 7pm on monday evening of the night of the attack. Todays operation involved armed units, some wearing military clothing. Got to the front door and was greeted by an armed Police Officer with a helmet, face mask machine gun. I asked him what was happening. Hejust said operations, 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 a 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 very clear that this is a network that we are investigating. It continues at a pace. Late afternoon and a new arrest, this time on the street in wigan. A man detained. Police say he was carrying a suspicious package. 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, 3,800 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 that they can support other areas. All of the Special Operations are aimed at discovering the circle linked to salman abedi, the 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. The bomb makers may still be at large. He returned to the uk from libya a few days before the attack. Abedi worshipped at the Didsbury Mosque. One of the trustees today condemned 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, salman abedi carried out a Suicide Attack at the manchester arena. 22 people were killed and 64 injured. Today, the New York Times revealed pictures from the crime scene in the foyer of manchester arena. They appear to show the remnants of the bombers rucksack, the metal fragments used in the attack, and a possible detonator located in his left hand. British Security Officials expressed astonishment and disbelief that the pictures had been leaked. All day in manchester, people have come to the town hall to lay flowers and remember. Just plain. Everyone seems to know someone who was there or their daughter had a friend there. Its like we are all linked together and we kind of. Its like it happened to someone in your family. I wanted to come, i bought a red, white and blue rose down and wrote some words. Ifelt like i had to come. 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. A prime challenge in the early stages of the investigation is to create a comprehensive profile of the bomber, salman abedi. Its known he was born here in manchester to libyan parents who came to britain as refugees from the regime of colonel gaddafi. Abedi was, for a period, a student at the university of salford. Its also known that hed travelled to libya and returned a few days before the attack. Our special correspondent ed thomas reports now on the bomber, his background and what may have motivated him. 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. Thats what the prophet teaches us. Some talk of erratic behaviour, of Abedi Chanting in the street. He was shouting in arabic. Eidams know the language. I dont know their language. 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 flag outside. With islamic writing on it . Ididnt i didnt really look at it. Was it english writing . No. A Community Worker who didnt want to go on camera has told us that two people who knew Salman Abedi At College went to 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 . This is his brother ismail, now under arrest in libya for supporting so called Islamic State. This is abedis father, affiliated to extremists, the Libyan Islamic fighting group, now back home in libya. On his facebook page, he praises alqaeda fighters in syria. Today he gave an interview in libya minutes before he was detained, defending himself and his son. Translation he does not belong to any organisation. I know this about him. He does not hide it from me. I a lwa ys him. He does not hide it from me. I always discuss things with me. I am sure andi always discuss things with me. I am sure and i believe that salman would not do such a thing, but there are hidden hands behind us, security organisations, in order to harm the libyan community, especially the youth. He did not travel to syria, i have seen his two passports and he never hides anything from me. There was no apology. Before he left south manchester, we are told he would sometimes lead in prayers in this mosque. Hes there all the time when the prayers are happening. Hes a guy who announces. Police now want to know if anyone else knew What Salman Abedi and his father believed. Salman abedis father was well known in the moss . Oh, yeah. A good man . He is a good man. Suhaib 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. Right. They did not show it to us. 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. A lot of thought needs to be done in the mosque. 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. Lets stay for a moment with the libyan context. Salman abedi had Strong Family links with libya, he travelled there recently, his pa rents a re travelled there recently, his parents are libyan by birth, his younger brother was arrested in tripoli today accused of links with so called Islamic State. In a moment well speak to our security correspondent Gordon Corera outside mi5, but first to our middle east correspondent, quentin sommerville, whos in libya where, as weve heard, the father and one of the brothers of salman abedi were arrested today. We mentioned these visits to libya by salman abedi, what is the likelihood of the possibility that he became radicalised on these visits . We have heard this evening from the militia which detained the younger brother, hashim, and ramadan, the father. Hashim was planning an attack in tripoli, they are holding him in the belief that he had links to the so called Islamic State. The journey taken by salman here was a regular trip. His parents left libya as part of an exodus during the time of one gaddafi. Gaddafi has said it was extremists who were fleeing here. That is not the whole story, another exodus happened in libya after 2011, when gaddafi was ousted. But exodus was thousands of libyan fighters heading towards the rear. They had ta ken fighters heading towards the rear. They had taken the skills they had learned in the Battle Against Gaddafi and hold them further in syria. Then they returned here to libya with those sharp and skills and set up a base for Islamic State and set up a base for Islamic State and syria within this country. Western governments do not have a presence inside libya. They closed all of their embassies, making it much more difficult for western intelligence agencies to have a presence and to gather information on the likes of the abedis and others who might have links to Extremist Groups in syria, iraq, in libya and in europe. Thank you, quentin. Lets go to m15 headquarters in london. Gordon, can we talk about the reports that there we re we talk about the reports that there were warnings given maybe five years ago about the conduct and views of salman abedi, what is the response to that . At m15 they are prepared for tough questions about what they knew and when about salman abedi. We know he was known to the authorities this morning, that is what the Home Secretary said, today we learned much more about a number of people raising concerns about Extremist Behaviour and that being flagged to the authorities. That would have meant a Risk Assessment would have been dead and there would be questions about whether anything was missed, anything significant. At m15 they stress that their priority is they stress that their priority is the current ongoing and urgent investigation into him, into that network, trying to establish particularly who made the bombs, because they look like sophisticated devices, a sophisticated device, from the picture leaked to the New York Times. That has raised concerns about who the bomb maker might have been, assuming it was not salman abedi. I understand there are concerns about unaccounted for materials, which might be chemicals used to make the bomb, there might be more out there which were purchased or gotten hold of van were used in this device, which might be one of the reasons that the threat level has gone up too critical. Gordon, on your comment about the Images Released in the american media, some thoughts on the tensions between the uk and the usa where this intelligent sharing is meant to happen . Real tension tonight. Yesterday there were concerns because british authorities were trying to keep the name of salman abedi out of the press to allow the investigation to continue, it was briefed by us Law Enforcement to us media and the Home Secretary said she talked to us counterparts, just hours after that there was an even larger leak of pictures from the investigation itself of the device. One person i spoke to said it was on another level and there was astonishment and disbelief in whitehall at the level of the leak. Police officers have said tonight that such a breach of trust, in their words, undermines the investigation. Strong words. Thank you. So far, 1a of the 22 victims of mondays bombing have been identified. They include 15 year old olivia campbell. She was named today. The police say they know the identities of everyone who was killed, but among those not named so far is an off duty policewoman who was at the concert. Her husband and two children survived, but theyre being treated for injuries. 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. Theyd 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. A friend wrote, our wonderful, iconic and beautiful 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 student 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 1a 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 1a and from leeds. Her mother and grandmother were injured, her grandmother critically. Her sister survived without injury. Miohelle kiss was married with three young children. Her family 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. Allan little, bbc news. Manchester. Alison howe and lisa lees lost their lives in the attack. Our Correspondentjudith Moritz has been to royton in 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 soulmates, 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. Were going to miss her loads. It must be very hard to take in this . It doesnt seem real yet. Its not sunk in. She was very selfless, did everything for us. Anyone in royton who knows us, knows all of us, and they all know us as a team, and were 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 da