Terror attack in London near Parliament

Union flags fly at half-staff in front of Big Ben at the Houses of Parliament in central London.

Police forensics teams search Parliament Square outside the Houses of Parliament in London.

Pedestrians cross Westminster Bridge in the shadow of the Houses of Parliament in London after the bridge reopened following the March 22 terror attack.

Police stand guard outside a flat in Birmingham, which was raided by anti-terror police in connection with the London attacks.

The front pages of U.K. daily newspapers reporting on the terror attack in central London.

A member of the public is treated by emergency services near Westminster Bridge and the Houses of Parliament in London following a terror attack.

Emergency services at the scene outside the Palace of Westminster in London. Police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.”

Armed police following major incidents outside the Houses of Parliament in London.

Emergency services transport an injured person to an ambulance, close to the Houses of Parliament in London.

A member of the public is treated by emergency services near Westminster Bridge and the Houses of Parliament in London.

Emergency services at the scene outside the Palace of Westminster in London.

Armed police in position outside the Houses of Parliament in London.

An iinjured man on London’s Westminster Bridge holds his knee in an image from video.

An injured man is helped to safety near Westminster Bridge in London.

Bystanders look on outside the police security perimeter near the Houses of Parliament.

An injured person is loaded into an ambulance near Westminster Bridge in London.

A police officer directs pedestrians back from the area around the Houses of Parliament in London.

Police secure the area close to the Houses of Parliament in London.

Armed police on a street outside the Houses of Parliament in London.

Police in London secure the area on the south side of Westminster Bridge close to the Houses of Parliament on Wednesday.

Police in London close the area near Houses of Parliament on Wednesday after reports of violence.

A police officer stands on Parliament Square outside of the Houses of Parliament in London on Wednesday after witnesses reported sounds like gunfire outside.