The 52-year-old Kent-born attacker had been convicted of violent offences and may have been a late convert to Islam 
 
 Detectives are piecing together the history of the Westminster terrorist Khalid Masood, a 52-year-old ex-convict who used a string of aliases and reportedly converted to Islam only in later life. 
 
 Masood was described by police as a criminal with a 20-year record of offending, who had once been investigated for extremism but was assessed as low risk. Reports have emerged that his birthname was Adrian Russell Ajao. He was earlier named as Adrian Elms. 
 
 
 
 London attack: police investigate terrorist Khalid Masood as death toll rises – live Read more 
 
 As police search for any evidence of a wider conspiracy, eight people remain in custody after properties across the UK were raided, while a picture emerged of the killer’s apparently nomadic lifestyle. 
 
 The death toll from his assault on the capital rose to four on Thursday night when a 75-year-old man, named as Leslie Rhodes from Streatham, south London, had his life support withdrawn at King’s College hospital. 
 
 The police said on Friday morning that two people remained in hospital in critical condition, with one of these considered to have “life-threatening” injuries, after Masood drove his car into pedestrians on Westminster Bridge before running into the parliamentary estate armed with two knives and fatally stabbing PC Keith Palmer before himself being shot dead. Fifty people have been confirmed as injured, with 31 requiring hospital treatment. Two police officers remained in hospital with significant injuries. 
 
 On Thursday night, thousands of people gathered to commemorate the victims of the attack in Westminster, and to hear speeches by the capital’s mayor and other leaders aimed at preventing terrorism from spreading division and hatred. 
 
 
 
 The vigil in Trafalgar Square, central London, was held to honour the dead and injured, Sadiq Khan said, but also “to send a clear, clear, message – Londoners will never be cowed by terrorism”. 
 
 Westminster vigil: we will never be cowed by terrorism, says mayor Read more 
 
 Earlier, prime minister Theresa May told MPs Masood had been previously known to MI5: “Some years ago, he was once investigated in relation to concerns about violent extremism. He was a peripheral figure. The case is historic – he was not part of the current intelligence picture.” 
 
 Amber Rudd, the home secretary, later added that Masood had spent time in jail, but not for terrorist offences, while the Metropolitan police said “Masood” was in all likelihood not his birth name. 
 
 The names of two people who died after Masood mowed them down on Westminster Bridge also emerged. 
 
 They were Kurt Cochran, 54, a US tourist from Utah celebrating his 25th wedding anniversary, and British-born Aysha Frade, 43, who worked at sixth-form college and had been walking over the bridge to pick up her daughters from school. 
 
 In the frenzied attack on Wednesday, Masood also stabbed to death PC Keith Palmer, a 48-year-old husband and father. 
 
 The prime minister said Palmer was “every inch a hero and his actions will never be forgotten”, while a crowdfunding appeal for his family has raised more than £364,000. 
 
 
 
 The attack was stopped when armed officers assigned to protect the defence secretary, Michael Fallon, shot Masood, who is believed to have been intent on entering parliament. Palmer died at New Palace Yard on the edge of the parliamentary estate, near Parliament Square, raising questions about security for legislators. 
 
 The original incident, in which Masood drove a Hyundai Tucson 4x4 into crowds at one of London’s busiest tourist spots, left 40 people injured, 29 of whom were taken to hospital. 
 
 In an emergency statement to the Commons, May said people from around the world had been caught up in the attack. “In addition to 12 Britons admitted to hospital, we know the victims include three French children, two Romanians, four South Koreans, one German, one Pole, one Irish, one Chinese, one Italian, one American and two Greeks,” she said. 
 
 London terror attack: what we know so far Read more 
 
 She also sounded a note of defiance, telling MPs: “Today we meet as normal, as generations have done before us and as future generations will continue to do, to deliver a simple message: we are not afraid and our resolve will never waver in the face of terrorism.” 
 
 May’s spokesman said she had received phone calls from world leaders including Angela Merkel, François Hollande and Donald Trump, offering their condolences and support, and had herself signed a book of condolence in parliament. She later visited the injured in hospital. 
 
 Police said Masood had been inspired by Islamic State. But he hid his extremism from his neighbours, coming across as a keen gardener and family man. 
 
 The domestic intelligence service will face questions over why Masood dropped off the radar after being investigated in relation to concerns over violent extremism. 
 
 An MI5 team has been set up to see what lessons can be learned from the case and to look at the decision to not put him under surveillance. The police and security services monitor an estimated 3,000 Britons, mainly Islamists, regarded as capable of terrorism, but it emerged he was not on this list. 
 
 Isis claimed responsibilty for the attack, although the claim could not be verified. Amaq, the news agency it uses to broadcast propaganda, issued a statement describing the attacker as a soldier of Islamic State, without naming him. 
 
 Police revealed that Masood, born in Kent on Christmas Day 1964, had a string of criminal convictions. In a statement, the Met said: “He was known to police and has a range of previous convictions for assaults, including GBH, possession of offensive weapons and public order offences. 
 
 “His first conviction was in November 1983 for criminal damage and his last conviction was in December 2003 for possession of a knife.” 
 
 The investigation is being led by SO15, Scotland Yard’s counter-terrorism command. Police staged raids across Birmingham, including Masood’s recent home in Winson Green, and at properties in London, Carmarthenshire and Brighton. 
 
 Neighbour Iwona Romek said Masood was a keen gardener, who lived in the modern mews house with his wife and young child. Romek, 45, said her experience of him was of a “nice man”. 
 
 She said the family had moved out suddenly in December 2016 and added: “I used to see him outside doing his garden. Never any trouble.” 
 
 It is believed that Masood rented the Hyundai car that he turned into a weapon of terror from the depot of a car hire firm, Enterprise, in Spring Hill, Birmingham. 
 
 Police still believe the attack was carried out by Masood alone, but are looking into whether others helped him. The eight arrests were all on suspicion of acts of preparation of a terrorist act, a key indication that police are investigating the possibility of a wider conspiracy. 
 
 A 39-year-old woman was arrested in east London, while two women aged 26 and 21 were detained in Birmingham. Five men aged 23, 26, 27, 28 and 58 were arrested in Birmingham. 
 
 PC Palmer’s family released a statement paying tribute to the police officer, who had a five-year-old daughter. They said: “Dedicated to his job and proud to be a police officer, brave and courageous. A friend to everyone who knew him. He will be deeply missed. We love him so much.” 
 
 As a mark of respect, Palmer’s shoulder number – 4157U – is to be retired and not reissued to any other officer, Scotland Yard said. 
 
 The Met has put extra officers on the streets and has extended the shifts they work from eight to 12 hours, until further notice. Forces outside London are also increasing their presence on the streets, to provide reassurance and to deter not only any further Islamist attacks but hate crimes against Muslims. 
 
 The Independent Police Complaints Commission began an investigation into the shooting of the suspect, which is mandated by law. ||||| An attacker who ran over several pedestrians on London’s Westminster Bridge before stabbing a police officer in the Houses of Parliament, killing three people and leaving 29 more injured in hospital before being killed by police, has been named by police as 52-year-old British-born Khalid Masood. 
 
 "Masood, aged 52 (25.12.1964), was born in Kent and detectives believe he was most recently living in the West Midlands. Masood was also known by a number of aliases," read a statement from London Metropolitan Police. 
 
 "Masood was not the subject of any current investigations and there was no prior intelligence about his intent to mount a terrorist attack. However, he was known to police and has a range of previous convictions for assaults, including GBH, possession of offensive weapons and public order offences. 
 
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 "His first conviction was in November 1983 for criminal damage and his last conviction was in December 2003 for possession of a knife. He has not been convicted for any terrorism offences." 
 
 The naming of the attacker followed the arrest of eight people in connection with the incident after police raided six addresses. 
 
 Earlier in the day, the Amaq News agency, which is often used by the Islamic State group to broadcast propaganda, said ISIS had claimed responsibility for the attack: "A soldier for the Islamic State carried out the operation in answer to calls to target the people of coalition states." 
 
 There was no confirmation that ISIS had directed the attack and British authorities didn't note any connection between Masood and the jihadist group. However, the incident was similar in nature to a series of attacks conducted in Europe using vehicles in recent months, notably in Nice and Berlin. 
 
 The attacker drove a car through pedestrians on Westminster Bridge, killing two people, before crashing into the railings outside the Houses of Parliament. He emerged from the vehicle and attempted to make his way into Parliament. Armed with a knife, he stabbed and killed unarmed police officer Keith Palmer before he was shot by armed police. 
 
 The attacker later died from his injuries. The two victims in addition to the police officer were named as London teacher Aysha Frade and American tourist Kurt Cochran. 
 
 Speaking Thursday morning, British Prime Minister Theresa May did not name the attacker but said that he was known to authorities. 
 
 “The man was British-born and some years ago was once investigated by MI5 in relation to concerns of violent extremism," she said in Parliament. "He was a peripheral figure. His case was historic. He was not part of the current intelligence picture.” 
 
 May called the attack "an act of terrorism aimed at trying "to silence our democracy." ||||| London (CNN) Police investigating the deadliest terror attack to hit the UK in 12 years named the perpetrator Thursday as a 52-year-old British man, Khalid Masood . 
 
 As the inquiry into the atrocity gathered pace, Prime Minister Theresa May revealed the attacker was once linked to violent extremism. He was thought to have been inspired by Islamist ideology, she said. 
 
 In an address to the House of Commons -- reconvened less than a day after it was placed in lockdown as the attack unfolded outside -- May vowed that Britain's freedoms and values would remain undiminished. 
 
 Masood then stabbed an unarmed police officer in as he stood guard at Carriage Gates, an entrance into a cobbled courtyard frequently used by Members of Parliament and staff. A fourth victim died Thursday night after his life support was withdrawn at a hospital. 
 
 An ISIS-affiliated news agency claimed that the extremist group was behind Wednesday's outrage, which left 29 people requiring hospital treatment. Six people remain critically ill. 
 
 Latest developments: 
 
 • Khalid Masood had previous convictions for violence but not terrorism offenses, police said. 
 
 • Kurt Cochran, from Utah, is named by family and his church as having died in the London attacks. 
 
 • Injured include 10 nationalities besides the British, among them French, South Korean and American. 
 
 • London Mayor Sadiq Khan led tributes at a vigil at Trafalgar Square, near the scene of the attack. 
 
 • Addresses were searched in Birmingham and elsewhere and a number of arrests were made. 
 
 • Queen Elizabeth II voices her "thoughts, prayers, and deepest sympathy" for all those affected. 
 
 May: 'Our values will prevail' 
 
 In a defiant speech, May vowed that Britain would not be cowed by the attack. 
 
 "Yesterday an act of terrorism tried to silence our democracy. But today we meet as normal -- as generations have done before us, and as future generations will continue to do -- to deliver a simple message: we are not afraid. And our resolve will never waver in the face of terrorism. 
 
 "And we meet here, in the oldest of all Parliaments, because we know that democracy -- and the values it entails -- will always prevail." 
 
 She said the police officer who was killed in the attack, PC Keith Palmer , was "every inch a hero and his actions will never be forgotten." 
 
 JUST WATCHED Minute of silence at UK Parliament after attack Replay More Videos ... MUST WATCH Minute of silence at UK Parliament after attack 01:29 
 
 May said the current threat level for Britain -- which has been at severe, the second highest, for some time -- would not be raised to critical because there was no specific intelligence that an attack was imminent. 
 
 Since 2013, police, security and intelligence agencies have successfully disrupted 13 separate terrorist plots in Britain, she said. "We know the threat from Islamist terrorism is very real. But while the public should remain utterly vigilant they should not -- and will not -- be cowed by this threat." 
 
 A tweet from ISIS-affiliated news agency Amaq said the attacker was "a soldier" of ISIS, inspired by its message. However, ISIS has provided no evidence for any direct links to the assailant, whom it did not name. 
 
 CNN Terrorism Analyst Paul Cruickshank said the language used by ISIS asserting the attack was by one of its "soldiers" did not necessarily mean the group was claiming direct connections to the attacker. This phrasing has been used in the past by the group for attacks ISIS believes it helped inspire, he said. 
 
 Investigation gathers pace 
 
 Masood, who was born in Kent and had been living in the West Midlands region of central England, had previous convictions for violence but not for terrorism offenses, police said. His most recent conviction was in 2003 for possession of a knife. 
 
 But he was not the subject of any recent investigations and there was no intelligence about his intent to mount an attack, the Metropolitan Police said. May said he was not part of the "current intelligence picture." 
 
 Britain's most senior counterterror police officer, Mark Rowley, earlier said inquiries were continuing in London, the West Midlands city of Birmingham and elsewhere. Arrests were made in Birmingham and London. 
 
 "It is still our belief -- which continues to be borne out by our investigation -- that this attacker acted alone yesterday and was inspired by international terrorism," Rowley said. 
 
 The car rental company whose vehicle was used in the attack said it was cooperating with the police. 
 
 Photos: Deadly attack outside UK Parliament A car is seen crashed into a fence outside the Parliament building in London on Wednesday, March 22. Police have launched a "full counter-terrorism investigation" after an attacker rammed a car into crowds of people and stabbed a police officer on Parliament grounds. Hide Caption 1 of 15 Photos: Deadly attack outside UK Parliament An armed police officer stands over the attacker, identified as Khalid Masood, outside Parliament. "It appeared that a car was coming towards the House of Commons mowing down pedestrians on the way," Member of Parliament Gerald Howarth told CNN. "The driver then got access to the parliamentary estate, stabbed a police officer and was shot." Hide Caption 2 of 15 Photos: Deadly attack outside UK Parliament Masood is treated by emergency services as police look on at the scene outside the Houses of Parliament. The Metropolitan Police say he was born in Kent, but is believed to have been living in the West Midlands recently. Police say Masood was also known by a number of aliases. "Masood was not the subject of any current investigations and there was no prior intelligence about his intent to mount a terrorist attack," Met Police said in a statement. Hide Caption 3 of 15 Photos: Deadly attack outside UK Parliament Member of Parliament Tobias Ellwood, in the glasses, tends to one of the injured people amid the chaos. The man the politician was trying to save was a police officer who died, a witness on the scene told CNN. Authorities identified the deceased officer as Keith Palmer, 48. Hide Caption 4 of 15 Photos: Deadly attack outside UK Parliament Emergency workers attend to injured people at the scene. Hide Caption 5 of 15 Photos: Deadly attack outside UK Parliament Medics treat a victim on Westminster Bridge. Hide Caption 6 of 15 Photos: Deadly attack outside UK Parliament People leave the Parliament building after the incident. Lawmakers were forced to remain in the main debating chamber of the House of Commons as police responded to the incident outside. Hide Caption 7 of 15 Photos: Deadly attack outside UK Parliament A person is treated at the scene. Hide Caption 8 of 15 Photos: Deadly attack outside UK Parliament Medical aid is provided outside Parliament. Hide Caption 9 of 15 Photos: Deadly attack outside UK Parliament Tourists were trapped for a time in cars on the London Eye Ferris wheel, which was stopped in the immediate aftermath of the attack. Hide Caption 10 of 15 Photos: Deadly attack outside UK Parliament A police officer stands guard near Westminster Bridge and the Houses of Parliament. Hide Caption 11 of 15 Photos: Deadly attack outside UK Parliament A person receives medical treatment at the scene. Hide Caption 12 of 15 Photos: Deadly attack outside UK Parliament At right, the car of British Prime Minister Theresa May is driven away from Parliament. Hide Caption 13 of 15 Photos: Deadly attack outside UK Parliament An air ambulance arrives at the scene. Hide Caption 14 of 15 Photos: Deadly attack outside UK Parliament Armed police enter the Houses of Parliament. Hide Caption 15 of 15 
 
 The attack was the first mass-casualty terrorist outrage in Britain since 2005 when 52 people died in the July 7 bomb attacks on the London public transportation system. 
 
 London Mayor Sadiq Khan told CNN that the city was protected by the best police and security services in the world. "I'm confident that we are doing all that we can to keep our city safe, to keep Londoners safe and to keep visitors safe," he said. Extra police officers will be patrolling London, he said. 
 
 Victims named 
 
 Police officer Keith Palmer was killed in the London attack, March 22, 2017. 
 
 The dead police officer was named as Keith Palmer, a member of the Metropolitan Police's parliamentary and diplomatic protection command unit. He was a husband and father, and had served in the Met for 15 years. 
 
 Aysha Frade, a 43-year-old teacher killed in the attack, was a British national whose mother is a Spanish national, a spokesman for Spain's Foreign Ministry told CNN. 
 
 Earlier, the mayor of the Spanish town of Betanzos, Ramon Garcia Vasquez, had told CNN that Frade was a Spanish citizen. Frade's family and relatives live in Betanzos, according to Vasquez. 
 
 Aysha Frade was also named as a victim of the terror attack in central London. 
 
 US citizen Kurt Cochran was in London celebrating his 25th wedding anniversary with his wife Melissa, who suffered a broken leg, broken rib and cut to her head, her brother Clint Payne posted to social media. 
 
 "Our hearts are broken this day as we say good-bye to our dear brother-in-law Kurt. He passed away from the injuries sustained in the London terrorist attack yesterday," he posted. 
 
 US President Donald Trump tweeted: "A great American, Kurt Cochran, was killed in the London terror attack. My prayers and condolences are with his family and friends." 
 
 Kurt Cochran (left) was in London celebrating his 25th wedding anniversary with his wife Melissa (right). 
 
 The unidentified fourth victim, a 75-year-old man, died Thursday night after his life support was withdrawn at a hospital where he had been receiving treatment, according to Met Police. 
 
 A number of tourists were among 40 people hurt in the assault, including five South Koreans and three French high school students. One Australian was hospitalized. A Chinese foreign ministry spokeswoman said one Chinese tourist was slightly injured. 
 
 May also listed citizens of Romania, Germany, Poland, Ireland, Italy and Greece among the victims. Twelve Britons required hospital treatment. 
 
 Vigil, condolences 
 
 A candlelit vigil was held Thursday evening in Trafalgar Square, not far from the scene of the attack, to show solidarity and remember the victims. 
 
 London Mayor Khan reiterated that London is a city that celebrates diversity. 
 
 "And when Londoners face adversity, we always pull together. We stand up for our values and we show the world we are the greatest city in the world." 
 
 UK Foreign Secretary Boris Johnson earlier led the UN Security Council in a moment of silence for the victims of terror in London and elsewhere. 
 
 "There are victims in London from 11 nations, which goes to show that an attack on London is an attack on the world," he said. 
 
 "And I can tell you from my talks here in the United States, with the US government and with partners from around the world, that the world is united to defeat the people who launched this attack, and to defeat their bankrupt and odious ideology." 
 
 The image of Britain's Union Flag was projected on the Brandenburg Gate in Berlin Thursday night in solidarity with London, while the Eiffel Tower went dark Wednesday in Paris, a city shaken by several attacks in recent years. 
 
 People echoed May's defiance online, sharing an image of the London Underground logo emblazoned with the words "We are not afraid." 
 
 World leaders expressed their condolences in phone calls with May. Trump said he pledged US support in "responding to the attack." ||||| LONDON — The knife-wielding terrorist who killed an American tourist and three others outside the U.K. Parliament was British-born and previously investigated for "violent extremism," according to officials. 
 
 Authorities identified the suspect as 52-year-old Khalid Masood but said he was known by a number of aliases. 
 
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 On Friday, police confirmed the attacker had been named "Adrian Russell Ajao" at birth. 
 
 They also released the first official photograph of the attacker's face and appealed for anyone with information about him to come forward. 
 
 If you have any information about Khalid Masood please contact us via the Anti-Terrorist hotline which is 0800 789 321 #WestminsterAttack pic.twitter.com/B74sXeKG56 — Metropolitan Police (@metpoliceuk) March 24, 2017 
 
 In addition to the new information about Masood, Metropolitan Police Acting Deputy Commissioner Mark Rowley said "two further significant arrests" had been made overnight, meaning nine people were in custody. A 10th suspect was released on bail. 
 
 He added that investigators had spoken to 3,500 witnesses and were examining 2,700 items seized during a series of raids — including "massive amounts of computer data." 
 
 "Clearly a main line in our investigation is what led him to be radicalized … was it through influences in our community, influences from overseas or from online propaganda," Rowley said. "Our investigation and arrests will help in that but the public appeal will make a real difference." 
 
 Citing sources, ITV News' security editor Rohit Kachroo reported that Masood was a Muslim convert. NBC News was not able to independently confirm that information. 
 
 Masood was known to security services as "a peripheral figure" and "was not part of the current intelligence picture," Prime Minister Theresa May told the House of Commons on Thursday. 
 
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 Police also said Masood was not the subject of any current investigations and there were no prior intelligence reports indicating his intent to carry out the terror attack. 
 
 Authorities said Masood was born in Kent — a county east of London. 
 
 Masood was known to police for a range of previous convictions, they said, including assaults, possession of offensive weapons and public order offenses. 
 
 His first conviction was in 1983 for criminal damage and his most recent was in December 2003 for possession of a knife. He was never convicted of any terror-related offenses. 
 
 Kurt Cochran and his wife Melissa Payne Cochran Family photo 
 
 Kurt Cochran, 54, who lives in Utah, was among the three slain, Church of Jesus Christ of Latter-day Saints spokesman Eric Hawkins told NBC News. His wife Melissa, whose parents are currently serving as missionaries in London, was also injured. They were celebrating their 25th wedding anniversary. 
 
 The others killed were a police officer, a mother-of-two who was hit by a bus as she ran from the attack, and a 75-year-old man who had been receiving medical treatment at a hospital. Police said Leslie Rhodes died Thursday night after life support was withdrawn. 
 
 The terrorist plowed a 4x4 rental vehicle into people walking on Westminster Bridge before crashing it into a railing outside the House of Commons. He later fatally stabbed the cop before being gunned down by armed officers. 
 
 Related: Teens on School Trip Witnessed London Attack 
 
 At total of 50 people were injured, with 31 requiring hospital treatment. 
 
 Police said early Friday that two people remained in critical condition after the attack, with one other sustaining life-threatening injuries. 
 
 A/Dep Cmsr Rowley: 2 officers who were injured in the attack also remain in hospital with significant injuries #WestminsterAttack — Metropolitan Police (@metpoliceuk) March 24, 2017 
 
 "It is still believed that this attacker acted alone and the police have no reason to believe that are imminent further attacks on the public," May said, just yards from Wednesday's carnage. 
 
 However, police raided properties in cities including Birmingham — where the culprit's vehicle was rented from Enterprise — and London. 
 
 "Clearly our investigation is ongoing … and is focused on his motivation, his preparation and associates," the Metropolitan Police's Rowley told reporters on Thursday. 
 
 A home raided in Birmingham was one where Masood lived until late last year, a neighbor told The Associated Press. Shown a photo of him, Iwona Romek said "that is 100 percent" the man who lived next door to her for about five months. 
 
 Police officers and civilians look at flowers left near Westminster Bridge on Friday following this week's terrorist attack. DARREN STAPLES / Reuters 
 
 Romek said Masood had a wife and child aged about 6. 
 
 "He seemed like a normal family man who liked to take care of his garden," she added. But one day she saw him packing their belongings in a black van, and then they were gone. 
 
 Amaq, the media unit of ISIS, released a statement describing the London attacker as "a soldier of the Islamic State" although it cited no evidence for the claim. 
 
 Charlie Winter, a senior research fellow at the London-based International Centre for the Study of Radicalisation and Political Violence (ICSR), said the claim framed the atrocity as inspired, not directed, by ISIS. "This distinction is hugely important," he wrote. 
 
 Related: Why London Doesn't Arm Most of Its Police Officers 
 
 ISIS has claimed responsibility after other attacks, including the Istanbul nightclub rampage on New Year's Eve and the Nice promenade truck massacre last July, without providing evidence. 
 
 One of the dead was identified as Aysha Frade, 43, a mother-of-two who was hit by a bus as she fled from the vehicle on Westminster Bridge. She was on her way to pick up her children from school. 
 
 The small Spanish town of Betanzos, where her family lives, declared three days of mourning. 
 
 Police Constable Keith Palmer, 48, was killed in Wednesday's attack. London Metropolitan Police via EPA 
 
 Lawmakers observed a minute's silence in tribute to slain police Constable Keith Palmer, 48, who died despite efforts to revive him by doctors and a passing government minister. 
 
 One of the wounded was a tourist who plunged from the bridge into the River Thames. The woman, who was in the city to celebrate her boyfriend's birthday, suffered serious head injuries and has badly damaged lungs, Romanian diplomat Dan Mihalache told Realitatea TV, according to The Associated Press. 
 
 May said the suspect had been investigated "some years ago" by the MI5 domestic intelligence service "in relation to concerns about violent extremism." 
 
 May added: "He was a peripheral figure. The case is historic. He was not part of the current intelligence picture. There was no prior intelligence of his intent or of the plot." 
 
 Related: British Spies Warned Terrorist Attack Was 'Highly Likely' 
 
 The prime minster told lawmakers that "the working assumption is that the attacker was inspired by Islamist ideology." 
 
 May also paid tribute to government minister Tobias Ellwood, who tried to save the dying police officer. "Yesterday we saw the worst of humanity but we will remember the best," she said. 
 
 Mayor Sadiq Khan promised "business as usual" in the capital. 
 
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 "London is a city that's been resilient in the face of terror attacks in the past," he told NBC News. "People are returning to work today … we're not going to allow a terrorist to divide our communities or change our way of life." 
 
 More police officers than usual were on patrol as the Metropolitan Police aimed to provide "reassurance." 
 
 Westminster Bridge remained cordoned off and the surrounding streets — normally thronged with commuters — were eerily quiet except for the buzz of a police helicopter. 
 
 Defense Minister Michael Fallon described Wednesday's atrocity as a "lone-wolf attack" but said investigators were still checking "whether other people were involved." 
 
 He added: "London is getting back to work. London has seen this before and is taking it on the chin." 
 
 As dusk fell, the mayor attended a silent vigil alongside several thousand people in Trafalgar Square. 
 
 "Those evil and tortured individuals who try to destroy our shared way of life will never succeed," Khan told the crowd. ||||| LONDON (Reuters) - The attacker who plowed a car through a throng of pedestrians and then stabbed a policeman outside Britain’s parliament was named on Thursday as Khalid Masood, a British-born man who was once investigated by MI5 intelligence officers over concerns about violent extremism. 
 
 The death toll from Wednesday’s attack on the heart of Britain’s democracy grew to five as police said one of the injured, a 75-year-man, had died in hospital after his life support was withdrawn. 
 
 That number included Masood, 52, who was shot dead by police. 
 
 The attack was the deadliest in Britain since 2005, when 52 people were killed by Islamist suicide bombers on London’s public transport system. 
 
 It followed a series of Islamist militant operations that have killed some 280 people in France, Belgium and Germany in just over two years, and marked the third occasion a lone attacker has used a vehicle as a weapon. 
 
 Islamic State claimed responsibility in a statement issued by its Amaq news agency, but did not name Masood and gave no details. It was not clear whether the attacker was directly connected to the jihadist group. 
 
 Police said Masood was born in the county of Kent in southeast England and was most recently living in the West Midlands region of central England. 
 
 “Masood was not the subject of any current investigations and there was no prior intelligence about his intent to mount a terrorist attack,” the Metropolitan Police said in a statement. 
 
 “However, he was known to police and has a range of previous convictions for assaults, including GBH (grievous bodily harm), possession of offensive weapons and public order offences.” 
 
 Prime Minister Theresa May told parliament the attacker had once been investigated by the MI5 intelligence agency over concerns about violent extremism, but had been a peripheral figure. 
 
 A U.S government source said Masood had associates with an interest in joining jihadist groups abroad, but there was no evidence he had done so himself. 
 
 “The people he was hanging out with did include people suspected of having an interest in traveling to join jihadi groups overseas but the attacker himself never did so,” the source said. 
 
 Police said Masood had never been convicted of a terrorist offense. His first conviction was in 1983 for criminal damage and his last one in December 2003 for possession of a knife. 
 
 MAYHEM 
 
 During five minutes of mayhem in the heart of London on Wednesday, Masood sped across Westminster Bridge in a car, mowing down pedestrians. He then ran through the gates of the nearby parliamentary precinct and fatally stabbed an unarmed policeman, Keith Palmer, before being shot dead. 
 
 “He will be deeply missed. We love him so much,” Palmer’s family said in a statement. The 48-year-old was married with a five-year-old daughter. 
 
 About 40 people were injured, of whom some were in critical condition. May visited some of them, her spokesman said. 
 
 Police officers walk past floral tributes placed near the scene of an attack close to the Houses of Parliament, in London, Britain March 24, 2017. REUTERS/Darren Staples 
 
 Police arrested eight people at six locations in London and Birmingham in the investigation into the attack, which May said was inspired by a warped Islamist ideology. All were suspected of preparing terrorist acts, police later confirmed. 
 
 The Enterprise rental car company said the vehicle used had been rented from its Spring Hill branch in Birmingham, which is in the West Midlands. 
 
 The bloodshed took place on the first anniversary of attacks that killed 32 people in Brussels. A minute’s silence was held in parliament and outside police headquarters on Thursday morning. 
 
 As dusk fell, hundreds gathered in London’s Trafalgar Square in a vigil to remember the victims. With traffic diverted away, volunteers handed out candles in an eerie silence. 
 
 Helen Pallot, 26, from just outside London, was holding a bunch of flowers she planned to lay nearby. 
 
 “I have got a lot of friends and family that work five minutes away from there, so it just makes you think,” she said. “It made me angry and sad and I wanted to come here and show that we can still all be here together.” 
 
 Speaking at the United Nations in New York, British Foreign Secretary Boris Johnson urged Internet providers and social media networks to do more to curb extremist propaganda. 
 
 “They’ve got to look at the stuff that’s going up on their sites, they’ve got to take steps to invigilate it, to take it down where they can,” he said. 
 
 “LONE-WOLF ATTACK” 
 
 The casualties included 12 Britons, three French children, two Romanians, four South Koreans, one German, one Pole, one Chinese, one American and two Greeks, May said. 
 
 Queen Elizabeth released a message saying: “My thoughts, prayers and deepest sympathy are with all those who have been affected by yesterday’s awful violence.” 
 
 U.S. tourist Kurt Cochran was named as one of the dead in a Facebook post by family member Shantell Payne. 
 
 “With a heavy heart I must pass the sad news of our beautiful brother, father, husband, son and friend Kurt Cochran, he could not overcome the injuries he received in the London terror attacks,” Payne wrote. 
 
 Her post said Cochran’s wife, Melissa Payne Cochran, was in hospital with a broken leg and rib and a cut on her head. 
 
 The couple were in Europe to celebrate their 25th wedding anniversary. 
 
 U.S. President Donald Trump paid tribute to Cochran in a tweet, calling him “a great American”. 
 
 Many have been shocked that the attacker was able to cause such mayhem in the heart of the capital equipped with nothing more than a hired car and a knife. 
 
 Slideshow (7 Images) 
 
 “This kind of attack, this lone-wolf attack, using things from daily life, a vehicle, a knife, are much more difficult to forestall,” Defence Secretary Michael Fallon told the BBC. 
 
 Three French high-school students on a school trip to London were among the injured. French Foreign Minister Jean-Marc Ayrault met some of their fellow students near the hospital where they were being treated. Their lives were not in danger. ||||| This is an undated photo released by the Metropolitan Police of Khalid Masood. Authorities identified Masood, a 52-year-old Briton as the man who mowed down pedestrians and stabbed a policeman to death... (Associated Press) 
 
 This is an undated photo released by the Metropolitan Police of Khalid Masood. Authorities identified Masood, a 52-year-old Briton as the man who mowed down pedestrians and stabbed a policeman to death outside Parliament in London, saying he had a long criminal record and once was investigated for... (Associated Press) 
 
 LONDON (AP) — The man who killed four people outside Britain's Parliament was in Saudi Arabia three times and taught English there, the Middle Eastern country's embassy said. 
 
 A Saudi Embassy statement released late Friday said that Khalid Masood taught English in Saudi Arabia from November 2005 to November 2006 and again from April 2008 to April 2009. 
 
 The embassy said that he had a work visa. It said he returned for six days in March 2015 on a trip booked through an approved travel agent. 
 
 The Saudi Embassy said that he wasn't tracked by the country's security services and didn't have a criminal record there. 
 
 Before taking the name Masood, he was known as Adrian Elms. He was known for having a violent temper in England and had been convicted at least twice for violent crimes. 
 
 Masood drove his rented SUV across the crowded Westminster Bridge on Wednesday, striking pedestrians. Then he jumped out and attacked police officer Keith Palmer, who was guarding Parliament, fatally stabbing him before being shot dead by police. 
 
 In all, he killed four people and left more than two dozen hospitalized, including some with what have been described as catastrophic injuries. The Islamic State group claimed responsibility for the attack. 
 
 British officials said security at Parliament will be reviewed after new footage emerged that showed large gates to the complex were left open after Masood rushed onto the grounds. 
 
 There are concerns accomplices could have followed him in and killed more people. The footage shows pedestrians walking by the open gates and even a courier entering the grounds. 
 
 The new footage follows the release of earlier video showing slight delays and confusion during the evacuation of Prime Minister Theresa May from Parliament as the attack unfolded. 
 
 Masood, who at 52 is considerably older than most extremists who carry out bloodshed in the West, had an arrest record dating to 1983. The violence came later, first in 2000 when he slashed a man across the face in a pub parking lot in a racially charged argument after drinking four pints, according to a newspaper account. 
 
 Hundreds of British police have been working to determine his motives and possible accomplices. Two people remain in custody for questioning. They are two men, aged 27 and 58, who were arrested in the central English city of Birmingham, where Masood was living. Authorities haven't charged or identified the two men. Others who were arrested in connection with the investigation have been released. 
 
 Details about how he became radicalized aren't clear. His time in Saudi Arabia may provide clues. He was also jailed in Britain and may have become exposed to radical views while an inmate. 
 
 Masood's last conviction was in 2003, also involving a knife attack. It's not clear when he took the name Masood, suggesting a conversion to Islam.
– Details are still trickling out about Wednesday's terror attack in London, and the BBC and the New York Times report that the attacker was identified Thursday by Metropolitan Police as 52-year Khalid Masood, who had been convicted for a series of non-terrorism-related crimes over a span of at least 20 years. A police statement says Masood also had a "number of aliases," per Newsweek. In a speech earlier Thursday before Parliament, Prime Minister Theresa May said the attacker was born in Britain (the BBC notes Masood was born in Kent) and had been on the radar of law enforcement and intelligence agencies some time ago during a probe into violent extremism, the BBC reports. "Our working assumption is that the attacker was inspired by Islamist ideology," she said, per the New York Times. However, May added that Masood (whom she didn't identify by name), who was shot dead by cops in the attack that killed three others, was a "peripheral figure" on the Islamist extremist scene and hadn't recently been under the microscope. ISIS has claimed responsibility for the attack, per the AP and the Telegraph, with a statement by the group's propaganda outlet stating that the attacker was a "soldier" of the Islamic State. Meanwhile, London Mayor Sadiq Khan posted a video statement of his own in which he noted, "Londoners will never be cowed by terrorism," per the Guardian. Khan also said, per journalist Christiane Amanpour's Twitter feed, he won't be commenting on the diss against him by Donald Trump Jr., noting, "I've been doing far more important things over the last 24 hours."