London police say at least four people were killed in a March 22 terrorist attack at the British Parliament — including a suspected attacker, a police officer stabbed by an assailant, and two people struck by the assailant’s vehicle when he rammed into pedestrians on Westminster Bridge.
Police said they believe a lone assailant carried out attack, which left at least 20 others injured, but that they were continuing a counterterrorism investigation and had not ruled out the possibility that others may have been involved.
The attack began at 2:40 p.m. local time, when a man drove a car at a high speed across Westminster Bridge and rammed into a group of pedestrians — killing at least two people — before crashing the vehicle into a railing beside the Parliament and London’s iconic Big Ben clock-tower.
Police said the attacker then got out of the vehicle and ran inside the Parliament’s security perimeter through a vehicle entrance gate and fatally stabbed a police officer.
He was then shot by plainclothes police officers and died after being taken away for treatment.
The police officer who was stabbed died later in a hospital.
Hospital officials said several people who were struck by the assailant’s vehicle suffered “catastrophic” injuries.
One woman who fell from the bridge into the River Thames was pulled out alive by rescue workers, but was said to have suffered serious injuries.
French Prime Minister Bernard Cazeneuve confirmed that three French school children, aged 15 to 16, were among those injured on Westminster Bridge.
Three London police officers were also among those struck by the vehicle on the bridge.
Westminster Bridge spans the River Thames and is used for vehicle and pedestrian traffic. It meets the Palace of Westminster compound near its northern end.
A spokesman for Prime Minister Theresa May said she was safe after the attack.
She had been in the House of Commons at the time of the attack and was quickly shuttled away by security to her office at 10 Downing Street, where she called for an emergency security meeting at her Cabinet Office Briefing Room.
A full counterterrorism investigation was launched by London Metropolitan Police.