Attack Outside UK Parliament.image courtesy:NBC News

An assailant was shot outside the British 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 a nearby bridge.

The House of Commons, which was in session at the time, was immediately suspended and lawmakers were asked to stay inside.

Three injured people were seen on the floor outside Parliament and the Palace was placed on an immediate lock down.

Prime Minister Theresa May is said to have been bundled into a car by a plain-clothes police officer and driven quickly from the scene.

Prime Minister Theresa May was safe after the incident, a spokesman for her office said. He declined to say where May was when the attack took place.

It is thought a lone attacker drove the vehicle across Westminster Bridge before crashing into a fence at the Houses of Parliament and getting into the grounds.  He is then said to have stabbed a police officer before he was shot by another policeman.Mobile phone footage on Twitter showed some injured people on the bridge.

Armed Police have opened fire and shot a person outside the Houses of Parliament. A vehicle was seen on social media to have crashed into the fence of the palace 

The alleged vehicle that mowed down people

London police said they were called to a firearms incident on Westminster Bridge near the British parliament.

“We were called at approx 2:40 pm to reports of an incident at #Westminster Bridge. Being treated as a firearms incident – police on scene,” the Metropolitan police tweeted.

Meanwhile, Transport for London said the underground station at Westminster has been shut at the request of the police.