The devastation imposed after a knifeman brought chaos to the heart of Westminster was captured by photographers and TV cameras at the scene.
The attacker mowed down pedestrians on Westminster Bridge, before slamming his car into railings and stabbing a policeman outside Parliament.
Dozens of emergency service personnel attended the incident, which left one police officer and at least two others dead.
The assailant was also shot dead by police.
At least 20 others were injured.
Photographs show the desperate scenes on Westminster Bridge after the attacker's vehicle drove into pedestrians and cyclists.
Victims can be seen lying on the road as as police and ambulance staff attend to them.
One photo shows a person praying by the side of the road, while officers can be seen desperately trying to clear roads around the bridge, which was closed at the request of the police.
Police are treating it as a terrorist incident.
Proceedings at the House of Commons were suspended following the incident and staff inside the building were told to stay in their offices.
