An armed police officer guard inside outside the Houses of Parliament in central London

At least four people were lying on the ground, some bleeding heavily and apparently unconscious, on Westminster Bridge near Britain’s parliament on Wednesday, Reuters photographs showed.
An assailant was shot outside parliament by armed police, the leader of the House of Commons said on Wednesday after loud bangs were heard and a Reuters photographer saw at least a dozen injured people on the nearby bridge.
The House of Commons session was suspended and members of parliament who were in the chamber were told to remain there.
Nearby Westminster underground train station was closed at the request of police.

Source: The National