4 Dead in London Terror Incident, Inc. Attacker

Emergency services transport an injured person to an ambulance, close to the Houses of Parliament in London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” The Metropolitan Police says in a statement that the incident is ongoing. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge. (AP Photo/Matt Dunham)

LONDON (AP) — The head of counterterrorism at London’s Metropolitan Police, says four people have died in the terror incident in London, including an attacker and a police officer.

Mark Rowley says some 20 people have been wounded and Parliament was locked down. A search is underway to make certain no other attackers are in the area — though police believe there was only one attacker.

Rowley said the dead policeman was one of the armed officers who guard Parliament. The other victims were on Westminster Bridge.

Rowley says “We are satisfied at this stage that it looks like there was only one attacker. But it would be foolish to be overconfident early on.”