What we know: An individual who apparently stabbed a police officer outside the Palace of Westminster in London was shot by responding authorities. The attacker is dead. Several individuals were struck on the nearby Westminster Bridge, apparently by a car that the attacker drove through pedestrians before attacking the officer. The officer who was stabbed and at least two other victims have died. The perpetrator who was killed is believed to be the only individual involved in carrying out the attack.

Update, 2:15 p.m.: Police have announced that the attacker who was shot after stabbing a police officer is dead. The officer who was attacked and at least two other victims have also died. Police do not believe there are any other attackers at large.

Update, 1:45 p.m.: The police officer who was stabbed earlier Wednesday in London is dead. London authorities have also said that a victim of the apparent vehicle attack was recovered, alive but with serious injuries, from the River Thames beneath the Westminter Bridge. It’s not clear if she was knocked off the bridge or jumped to avoid being hit.

Update, 12:30 p.m.: A doctor at London’s St. Thomas Hospital has told reporters that one woman involved in Wednesday’s incidents has died. It’s not clear how she was injured.

Update, 11:30 a.m.: Here’s video, taken by a former Polish foreign minister, of injuries on Westminster Bridge.

A car on Westminster Bridge has just mowed down at least 5 people. pic.twitter.com/tdCR9I0NgJ — Radosław Sikorski 🇵🇱🇪🇺 (@sikorskiradek) March 22, 2017

And here’s a shot of the car that has crashed into a fence outside the palace.

UK police are investigating a "firearms incident" near the British Parliament in London. https://t.co/MnJJgd7A7K pic.twitter.com/1TXalzLKCZ — CNN Breaking News (@cnnbrk) March 22, 2017

Original post, 11:16 a.m.: Police have fired on an assailant who attacked an officer near the Palace of Westminster, the iconic building in which the United Kingdom’s Parliament meets, the leader of the House of Commons has announced. Several individuals on the nearby Westminster Bridge appear to have been hit by a car in an incident whose relation to the stabbing is unknown.

Parliament was in session Wednesday inside the palace, which has been locked down. We’ll update this post when more details become available.