London Parliament attacker was British-born, had been investigated in past

LONDON — The knife-wielding terrorist who killed three people outside the U.K. Parliament was British-born and was once investigated by security services over "violent extremism," Prime Minister Theresa May said Thursday.

The attacker was known to police as "a peripheral figure" and "was not part of the current intelligence picture," she told the House of Commons.

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Tributes/vigils for the victims of the London attack
A floral tribute to the victims of yesterday's terror attack is left at the security cordon near Westminster Abbey in central London on March 23, 2017. Seven people have been arrested including in London and Birmingham over Wednesday's terror attack at the British parliament, the police said today, revising down the number of victims to three people. / AFP PHOTO / DANIEL LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Indian sandartist Sudarsan Pattnaik gives the final touches to a sand sculpture on Puri Beach, some 65kms from Bhubaneswar on March 23, 2017, the day after an attack in London. Seven people have been arrested including some in London and Birmingham over the terror attack at the British parliament, the police said, revising down the number of victims to three / AFP PHOTO / STR (Photo credit should read STR/AFP/Getty Images)
The building of the city hall in Tel Aviv's Rabin square in Israel is illuminated in solidarity with Britain for the attack on Westminster Bridge in London March 22, 2017. REUTERS/Nir Elias
Flowers are laid at the scene after an attack on Westminster Bridge in London, Britain, March 22, 2017. REUTERS/Hannah McKay
People leave flowers at the scene after an attack on Westminster Bridge in London, Britain, March 22, 2017. REUTERS/Hannah McKay
Flowers and messages are left near the scene of an attack by a man driving a car and weilding a knife left five people dead and dozens injured, in London, Britain, March 23, 2017. REUTERS/Neil Hall
Flowers are left outside New Scotland Yard after a minute's silence the morning after an attack by a man driving a car and weilding a knife left five people dead and dozens injured, in London, Britain, March 23, 2017. REUTERS/Neil Hall TPX IMAGES OF THE DAY
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She was speaking yards from the scene of Wednesday's carnage, which also injured 29 others. An American and three French children on a school trip were among those wounded.

The dead included a police officer and a mother-of-two who was hit by a bus as she ran to safety.

The terrorist plowed a 4x4 rental car into people walking on Westminster Bridge before crashing it a railing outside the House of Commons. He later fatally stabbed the cop before being gunned down by armed officers.

"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.

However, police overnight raided at least six properties in cities including Birmingham — where the culprit's vehicle was rented from Enterprise — and London, making eight arrests.

"Clearly our investigation is ongoing ... and is focused on his motivation, his preparation and associates," Metropolitan Police Acting Deputy Commissioner Mark Rowley told reporters early Thursday.

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.

Rowley said that seven of the wounded were still in critical condition on Thursday.

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.

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 attacker's name would be released "when operational considerations allow."

She said he 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."

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 invited Londoners to an evening vigil and promised "business as usual" in the capital.

"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."

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