Two men have been shot outside parliament after charging the gates of parliament and attacking officers, it has been reported.
Witnesses say a car mowed down five pedestrians before crashing into the gates outside Portcullis House.
The leader of the House of Commons says an alleged assailant was shot by armed police.
According to the Telegraph, a man is lying shot outside the gates to parliament.
It has also been reported that a man was seen with a knife.
The building is in lock down. Staff inside parliament have been told to stay inside their offices.
Scotland Yard said it was called to a firearms incident on Westminster Bridge amid reports of several people injured.
An air ambulance has landed in Parliament Square.
Transport for London says Westminster Underground station has been shut at the police’s request.