Who Is The London Attacker? Everything We Know About The Brit In The Westminster Attack

UPDATE: 11:33 a.m. EST — Authorities have released the name of the suspect in Wednesday's terror attack in London. Khalid Masood, 52, was born in Kent and had previous convictions on assault and weapons possession charges, police said.

Original story:

Authorities did not release the name of the man who was shot and killed by police after Wednesday's deadly terror attack on Westminster bridge in London, just outside the U.K. parliament. But some preliminary facts started to emerge about the man who drove a sports utility vehicle into crowds on the bridge, injuring at least 40 and and killing three more, before abandoning the vehicle and stabbing a police officer to death. Below is what we know so far.

He was born in Britain.

Prime Minister Theresa May addressed Parliament Thursday and told lawmakers the suspect was born in Britain, allaying fears the attack was carried out by a refugee.

Read: Did ISIS Attack London? Islamic State Claims Its 'Soldier' Carried Out Deadly Parliament Plot

He acted alone.

May said, "It is still believed the attacker acted alone and police have no reason to believe there are imminent further attacks on the public." However, police performed raids of six addresses in London and the city of Birmingham, about 120 miles northwest of London, resulting in at least eight arrests.

He was inspired by Islamic ideology.

Authorities claimed the man was inspired by radical Islamic ideology, but no specific connections to terror groups have been found at this stage of the investigation. ISIS claimed responsibility for the attack, saying on its Amaq propaganda agency the man was a "solider of the Islamic state."

As part of its propaganda efforts, ISIS has often been quick to claim responsibility for virtually any terror attack against the West that is connected to Islamist ideology. ISIS's statement didn't claim any direct involvement with the attacks, but said the man was following calls made by the group to attack civilians in countries allied with the U.S.-led coalition bombing Syria and Iraq, the Independent reported.

He was known to British Intelligence

In her address to Parliament, May said the suspect was known to MI5, the U.K.'s domestic intelligence agency.

"He was once investigated in relation to concerns about violent extremism," May told Parliament. But May also emphasized that he was investigated "some years ago" and the "case was historic." She also said he was a "peripheral figure" in the investigation.