The head of counterterrorism at London’s Metropolitan Police says four people have died in the terror incident in London, including the attacker.

29 people were wounded and Parliament was locked down on Wednesday.

MP’s returned to work Thursday and held a moment of silence for the victims, which include a police officer who was guarding Parliament.

Officials say a man with a knife attacked a police officer at Parliament and was shot by officers.

The other victims were on Westminster Bridge, where an SUV mowed down pedestrians.

A senior police commander says the attack at London’s Parliament has been declared a terrorist incident and “a full counterterrorism investigation is underway.”

A man outside Britain’s Parliament says he couldn’t believe what he was seeing when a man with a big knife started plunging the weapon into a policeman.

Rick Longley also told the Press Association that someone also crashed a car into a fence near Big Ben and “took some pedestrians out.”

British police have carried out raids and arrested seven people in connection with the terror attack.

Wednesday was the first anniversary of the attacks at the airport and on the subway in Brussels that killed 32 people and injured 300 others.

(With files from The Canadian Press)

Filed under: London, Parliament, UK