A major terrorism investigation is under in the UK following the attack in Westminster.
Four people are dead including the attacker and a police officer.
At least two of those killed were hit by the car driven by the man as he ran down people walking across Westminster Bridge.
Shortly after, a police officer has been stabbed and killed and the alleged assailant, who was trying to get into the nearby Houses of Parliament, was shot and killed.
New Zealand journalist Josh White describes the scene in London after today's terrorist attack that's left at least four people dead, including a police officer. He says the city is in shock.