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.
Four people died in the attack. An American man and a British woman of Spanish origin were killed when Masood rammed a rental car onto the sidewalk on Westminster Bridge.
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 A fourth victim died Thursday night after his life support was withdrawn at a hospital.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.