Twenty people were injured and four were reported dead in London on Wednesday after a car crashed into pedestrians near the British parliament and an assailant stabbed a policeman in what police called a terrorist incident.
The knifeman was then shot by police in the shadow of Big Ben, where he had tried to force his way into a courtyard just outside the Houses of Parliament.
The incident appeared to have unfolded in several locations, including on nearby Westminster Bridge where eyewitnesses said a car had crashed into pedestrians.
Reuters reporters inside parliament heard loud bangs and shortly afterwards saw two people lying on the ground in a courtyard just outside.
The incident took place on the first anniversary of attacks by Islamist militants that killed 32 people in Brussels.
“I just saw a car go out of control, and just go into pedestrians on the bridge,” a woman told Sky News. She was on a tour bus on the bridge at the time.