An attacked killed three people near the U.K. Parliament before being shot dead. Among the fatalities are two pedestrians and a police officer. Prime Minister Theresa May is set to chair an emergency meeting.

This event was London’s worst terror attack in more than a decade. Four people are dead and at least 20 are injured.

London Terrorist Attack: Four Killed Near U.K. Parliament, Car Plows, Before Being Shot Dead

The attack shut down Parliament, leaving hundreds of workers in lockdown for several hours. Prime Minister Theresa May was in the lobby of the House of Commons before she was taken to safety in a Jaguar. She made a statement at 9pm before chairing an emergency security meeting. She said in front of residence, just 10 minutes away, quote “The location of this attack was no accident. The terrorists chose to strike at the heart of our capital city.”

A car crashed into a fence outside Parliament after running down pedestrians on Westminster Bridge. A man with a knife then ran through the gate and through security, assaulted a policeman and was shot. Among the dead were two people on the bridge.

Witnesses describe an Asian man in 40s with an eight-inch long knife.