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The man who killed four people near Britain’s Houses of Parliament on Wednesday had spent time working in Saudi Arabia but did not have a criminal record there or attract the attention of the security services, the Saudi Embassy in London said on Friday.

Khalid Masood had been in the kingdom for two one-year periods, from November 2005 and April 2008, when he worked as an English teacher, and also visited briefly in March 2015.

“During his time in Saudi Arabia, Khalid Masood did not appear on the security services’ radar and does not have a criminal record in the Kingdom of Saudi Arabia,” the embassy said in a statement on its Twitter account.

The embassy said King Salman had spoken to Prime Minister Theresa May to express his condolences over Wednesday’s attack, adding: “At such a time, our ongoing security cooperation is most crucial to the defeat of terrorism and the saving of innocent lives.”

Masood was shot by police on Wednesday after a rampage through Westminster.

At least 50 people from 12 different countries were injured when Masood ploughed his rented car into crowds of people walking along the pavement on Westminster Bridge, before crashing the vehicle into the fence outside parliament.

Three people on the bridge died after being hit by the speeding car, then the attacker leapt out and fatally stabbed a police officer just inside the gates of the Houses of Parliament before being shot dead.

History of violence

Police said the 52-year-old Briton was found to have a history of violent offenses but no terrorist convictions.

A passport-style photo of Masood, released by police, shows a black man with a shaved head and a beard. He also used the names Adrian Elms and Adrian Russell Ajao among other aliases.

Long before his short stints in jail turned into years behind bars, Masood was known as Adrian Elms, with a reputation for drinking and an unpredictable temper.

At least twice he was convicted of violent crimes, well before he stabbed a police officer to death Wednesday in London with a motion that one horrified witness described as “playing a drum on your back with two knives.”

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.

The victim, Piers Mott, was scarred for life, said his widow, Heather.

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.

Heather Mott said Masood appeared to come out of jail “even worse.” She said she got chills when she learned the identity of the London attacker.

“What a pity they didn’t realize he was a nutter,” she said.

Search for clues

Police are combing through “massive amounts of computer data” and have contacted 3,500 witnesses as they look for clues as to why the British-born man launched the deadly attack.

“Clearly that’s a main line of our investigation is what led him to be radicalized: Was it through influences in our community, influences from overseas or through online propaganda? Our investigations and our arrests will help in that, but the public appeal will make a big difference if people come forward with more information,” said Britain’s top counterterrorism officer, Mark Rowley.

Prime Minister Theresa May said Masood was “investigated in relation to concerns about violent extremism” years ago. But she called him “a peripheral figure.”

The Daesh group described Masood as “a soldier,” claiming responsibility for the attack. Rowley said police are investigating whether he “acted totally alone inspired by terrorist propaganda, or if others have encouraged, supported or directed him.”

People made arrests across the country as they investigate whether anyone else helped Masood prepare his attack. Six people were released without charge Friday night, leaving four in custody on suspicion of preparing terrorist acts.

Detectives have searched 21 properties in London, Brighton, Wales, Manchester and the central English city of Birmingham in one of Britain’s biggest counterterrorism operations in years. Wednesday’s attack was the deadliest in Britain since suicide bombers killed 52 commuters on London’s transit system on July 7, 2005.

Jolly before the attack

Once Masood’s identity became known, police and the media began tracing his final hours.

The manager of the Preston Park Hotel in the beachside city of Brighton where Masood stayed the night before the attack said he seemed unusually outgoing and mentioned details about his family, including having a sick father.

“He was normal, in fact friendly, because we spent possibly five or 10 minutes talking to him about his background and where he came from,” Sabeur Toumi told Sky News. He was “laughing and joking, telling us stories about where he lived.”

Police raided the room, searching for clues about Masood.

Masood’s mother lives in rural Wales, according to a website on which she sells handmade cushions and handbags. The listings on Folksy by Janet Ajao have been taken down, but in an archived version of the site, she describes living in “rural west Wales with my husband, border collie and a few chickens.” Calls to the home in remote Trelech, Wales, went unanswered Friday.

When Masood was in school, he took his stepfather’s name, Ajao. He was athletic and popular in high school, known as someone who liked to party, according to Stuart Knight, a former classmate, who said the young man was one of only two black students in the school of 600.

“I am in shock — that is not sympathy for what he has done — he was a nice guy and I’m surprised he turned and did what he did,” Knight said.

Not from Muslim neighborhood

In one of the last places Masood lived, a home in Birmingham, neighbors recalled him as a quiet man whose wife was veiled and who wore traditional Muslim clothing. But the neighborhood is not among one of the city’s many Muslim enclaves, suggesting he was not deeply embedded in its religious community.

Moazzam Begg, a former Guantanamo prisoner born and raised in Birmingham, said the details emerging of the attacker’s life raised questions about where he was radicalized.

“He did not live in a Muslim neighborhood. In my mind, in my analysis, he was probably a drifter,” said Begg, adding that no one he knew in the community had met Masood. “I’d also be surprised if he had any connection with a mosque, because sadly they are places where you can no longer discuss politics or air grievances.”

Since British authorities began cracking down on mosques, many people are instead being radicalized online, Berg added.

Cultural and religious alienation can fuel such violence, he added.

Begg helps run a group called Cage that has encountered extremists who spoke of their alienation before they committed attacks. While in prison, Begg said he saw others who succumbed to radicalism. He said groups like Daesh can exploit people’s weaknesses and criminality.

Late Friday, the British government honored a lawmaker who battled to save the life of the police officer slain in the Parliament attack, giving him mouth-to-mouth resuscitation.

May’s office said Tobias Ellwood has been named to the Privy Council, a committee of senior lawmakers, judges and others that advises Queen Elizabeth II. The institution dates back a millennium.

Security Minister Ben Wallace, who helped coordinate the government response to Wednesday’s attack, was also named to the council.

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