Image copyright Met Police Image caption Attackers Khuram Butt (left) who was known to police and the security service and Rachid Redouane 
 
 The Metropolitan Police have defended a decision to downgrade an inquiry into one of the men who carried out Saturday night's terror attack. 
 
 They said Pakistan-born Khuram Butt, 27, of Barking, London, was known to police and MI5 in 2015, but there had been no evidence of a plot. 
 
 The two other perpetrators were not known to security services. 
 
 A minute's silence was held at 11:00 BST on Tuesday to remember victims and those who were affected. 
 
 Seven people were killed and 48 injured in the attack which began at 21:58 BST on Saturday night. NHS England said 36 people remained in hospital, with 18 in a critical condition. 
 
 All 12 people arrested on Sunday after the London attack have now been released without charge. 
 
 On Tuesday, counter-terror officers were searching a property in Ilford, east London, after entering the address at around 01:30 BST. No arrests had been made, police said. 
 
 Butt and his two accomplices drove a hired van into pedestrians on London Bridge before stabbing people in the area around Borough Market. 
 
 All three men were shot dead by police within eight minutes of receiving a 999 call. 
 
 Butt had featured in a Channel 4 documentary The Jihadis Next Door, broadcast last year. 
 
 Another of the attackers has been named by police as Rachid Radouane, 30, from Barking. He was a chef who also used the name Rachid Elkhdar and police said he claimed to be Moroccan-Libyan. 
 
 What did police know about Khuram Butt? 
 
 Media playback is unsupported on your device Media caption Khuram Butt was shown in a documentary about extremists 
 
 Butt featured in a Channel 4 documentary last year about Islamist extremists with links to the jailed preacher Anjem Choudary. 
 
 The married father-of-two, who worked for London Underground as a trainee customer services assistant for nearly six months last year, could be seen in the programme arguing with police officers in the street, after displaying a flag used by so-called Islamic State in a London park. 
 
 Two people in Barking, east London, had also raised concerns about Butt, the BBC's home affairs correspondent Dominic Casciani said. 
 
 One man called the anti-terrorism hotline in 2015, and a woman went to the local police because she was scared Butt was trying to radicalise her children. 
 
 Metropolitan Police assistant commissioner Mark Rowley said an investigation into Butt began in 2015, but "there was no intelligence to suggest that this attack was being planned and the investigation had been prioritised accordingly". 
 
 The inquiry was "prioritised in the lower echelons of our investigative work", Mr Rowley added. 
 
 Asked if that had been a poor decision, Mr Rowley said he had seen nothing yet to suggest it, according to the BBC's home affairs correspondent, Danny Shaw. 
 
 At any one time there are around 500 active counter-terrorism investigations concerning 3,000 people of interest. 
 
 Mr Rowley said work was continuing to understand more about the attackers, "their connections and whether they were assisted or supported by anyone else". 
 
 Analysis: Khuram Butt showed his extremist colours 
 
 By Dominic Casciani, BBC Home Affairs correspondent 
 
 Image copyright Patrick Evans 
 
 It's still not clear when Khuram Butt got involved in radical Islamist politics, but there is ample evidence that he was involved in the al-Muhajiroun network - certainly in 2015 and potentially at least two years earlier still. 
 
 The main evidence comes from his appearance in a Channel 4 documentary, The Jihadis Next Door, broadcast last year. 
 
 The film was a close encounter with part of the ALM network and one of its subjects was Siddhartha Dhar, one of Anjem Choudary's right-hand men. 
 
 Dhar later skipped bail for Syria. Once there, he appeared in a black mask in an IS execution video. 
 
 Butt's links may go back further still. Mohammed Shafiq of the Manchester-based Ramadhan Foundation, an anti-extremism group, says that he believes he was verbally assaulted by Butt in 2013 - the day after another ALM follower killed Fusilier Lee Rigby in Woolwich, south-east London. 
 
 Who were the victims? 
 
 Image copyright Family handout/Reuters Image caption James McMullan's family believe he was among those killed. Chrissy Archibald (right) had come to London to be with her fiance. 
 
 Canadian national Chrissy Archibald, 30, was the first victim to be named. Her family said she had died in her fiancé's arms after being struck by the attackers' speeding van. 
 
 The sister of 32-year-old James McMullan, from Hackney, east London, said he was believed to be among those who died, after his bank card was found on a body at the scene. 
 
 A French national was also killed in the attack, according to foreign minister Jean-Yves Le Drian. 
 
 The Met have set up a casualty bureau on 0800 096 1233 and 020 7158 0197 for people concerned about friends or relatives. 
 
 'You will not win' 
 
 A vigil was held at Potters Field Park by the River Thames on Monday evening to remember the victims. 
 
 Mayor of London Sadiq Khan led the short ceremony. Addressing the attackers, he said: "We will defeat you. You will not win." 
 
 A book of condolences will open on Tuesday at Southwark Council's headquarters in Tooley Street. 
 
 Prime Minister Theresa May, who has already signed it, said in her message that British values are "superior to anything offered by the preachers and supporters of hate". 
 
 Image copyright PA 
 
 In the days since the attack, Labour has been targeting cuts to the Home Office's policing budget, accusing Theresa May of "letting austerity damage her ability to keep us safe". 
 
 Speaking on Tuesday, Mr Khan warned it could be harder to "foil future terrorist attacks" if the Conservatives cut police budgets in London. 
 
 "The Conservative plans mean another £400m of cuts to the Met," he said. "I'm simply not willing to stand by and let this happen." 
 
 Foreign Secretary Boris Johnson insisted police numbers "remained high" and that the security services did an "incredible job at keeping people safe". 
 
 Mr Johnson told BBC Breakfast: "All that argument detracts from the responsibility of those scumbags and what they have done." 
 
 Get news from the BBC in your inbox, each weekday morning ||||| A child looks at the floral tributes after a vigil for victims of Saturday's attack in London Bridge, at Potter's Field Park in London, Monday, June 5, 2017. Police arrested several people and are widening... (Associated Press) 
 
 LONDON (AP) — British police have named the third London Bridge attacker as 22-year-old Youssef Zaghba, and said that he is believed to be an Italian national of Moroccan descent. 
 
 Police said Tuesday he lived in east London and that his family has been notified, adding that he was not a "subject of interest" to police or the intelligence services. 
 
 The other two attackers were named Monday as Khuram Shazad Butt and Rachid Redouane. 
 
 The identity of the last attacker in Saturday's attack that left seven dead and dozens wounded came as a new search was underway in a neighborhood in east London near the home of two of the London Bridge attackers. The search in Ilford, just north of Barking, is seeking to determine whether the group had accomplices. 
 
 London police have said all 12 people held since the attack late Saturday from the Barking neighborhood, have been freed. 
 
 The attack, the third in Britain in three months, has raised questions over the government's ability to protect Britain following cuts to police numbers in recent years. The issue has become a key one in the run-up to Thursday's general election. 
 
 Prime Minister Theresa May, who called the snap election in hopes of strengthening her mandate for discussions over Britain's exit from the European Union, has come under fire for the cuts to police numbers over recent years. A string of opinion polls over the past couple of weeks have pointed to a narrowing in the gap between her Conservative Party and the main opposition Labour Party. 
 
 One of the attackers, Butt, had appeared in a documentary "The Jihadis Next Door" and was known to investigators but police said he was not believed to be plotting an attack. The second man, Rachid Redouane, had not aroused any suspicions. The three, who were wearing fake suicide vests, were shot dead during the attack. 
 
 The Islamic gym where one of the London Bridge attackers trained says they saw nothing of concern during his time there. 
 
 In a letter posted outside Tuesday, the Ummah Fitness Centre said staff would "help the police in any way we can" as investigators try to learn more about Khuram Shazad Butt, who was one of those who rammed a van into pedestrians on London Bridge and then slashed and stabbed people in nearby Borough Market. 
 
 Neighbors described Butt as an avid weightlifter and Transport for London confirmed he worked for London Underground in customer service before leaving last October. 
 
 London Mayor Sadiq Khan said questions would need to be asked about what the police knew about Butt. He has said cuts in the number of police officers have had an impact on the ability to prevent attacks. 
 
 Much of the area around London Bridge remained cordoned off as commuters struggled to work in the driving rain. 
 
 The area around Borough Market is not expected to reopen Tuesday. 
 
 The nearby London Bridge station was operational though one of the exits that leads to the cordoned off area on Borough High Street remained closed. 
 
 Transport for London, which oversees the capital's transport network, has advised commuters to make alternative journeys as the station will be busy. 
 
 A minute's silence was observed in Britain at 11 a.m. local time (1000 GMT) in memory of those killed during the attack. 
 
 Questions remain over whether investigators had the resources to look into complaints such as those leveled by Butt's neighbors about his attempts to radicalize children and whether crucial opportunities were missed that could have saved lives. 
 
 Saturday's attack was the third in as many months involving suspects who had been on the radar of British authorities. All three have been claimed by the Islamic State group. 
 
 The country's official terror threat level remains at "severe," one notch down from the highest. 
 
 It had been set at "critical" in the days after the Manchester concert bombing on May 22 that killed 22 people — reflecting a judgment that an attack might be imminent because accomplices with similar bombs might be on the loose. 
 
 It was lowered once intelligence agencies were comfortable this wasn't the case. Authorities have said the London attack was apparently unconnected to the Manchester bombing.
– One of the three suspects in the London Bridge attack was known to police. Khuram Shazad Butt, who may have had links to jihadist group Al-Muhajiroun, had been the subject of a Metropolitan Police investigation beginning in 2015. However, the investigation was "prioritized in the lower echelons" because "there was no intelligence to suggest that this attack was being planned," a rep tells the BBC. A man and a woman living in east London had both contacted police about Butt, with the woman suggesting he had tried to radicalize her children. According to the Times, Butt had links to both radical Islamic preacher Anjem Choudary and Mohammad Sidique Khan, who planned the 2005 London bombings. Khan worked at an Ilford fitness center that Butt, a 27-year-old father of two, would frequent to try and radicalize youth, the Times reports. Butt also appeared in a 2016 Channel 4 documentary about Islamist extremists with ties to Choudary. He was seen arguing with police after carrying an Islamic State flag. Yet Butt still managed to get a job with the London Underground. The UK citizen born in Pakistan served as a trainee customer service assistant for almost six months in 2016, per the BBC. "People are going to look at the front pages today and they are going to say 'how on earth could we have let this guy—or possible more—through the net,'" Foreign Secretary Boris Johnson says, per Buzzfeed. Police previously identified Rachid Redouane, 30, who claimed to be Moroccan and Libyan, as another of the attackers. On Tuesday, they named the third: Youssef Zaghba, 22, believed to an Italian national of Moroccan descent, reports the AP. Neither he nor Redouane appeared to be on police radar prior to the attack.