PHOTOS: Fatal terror incident outside Parliament in London

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Wednesday, March 22, 2017
A man is treated by emergency services, as a knife lays on the floor, outside the Houses of Parliament London, Wednesday, March 22, 2017.
Mark Rowley, Assistant Commissioner for Specialist Operations in the Metropolitan Police, speaks to the media outside Scotland Yard in London, Wednesday, March 22, 2017.
Police forensic officers at the scene close to the Houses of Parliament in London, Wednesday, March 22, 2017.
Emergency services on Westminister Bridge after a policeman was stabbed and his apparent attacker shot by officers.
Emergency services staff provide medical attention close to the Houses of Parliament in London, Wednesday, March 22, 2017.
Armed police walk past emergency services attending to injured people on the floor outside the Houses of Parliament, London, Wednesday, March 22, 2017.
Armed police outside the the Houses of Parliament, London, Wednesday, March 22, 2017.
An injured man sits covered with a blanket as emergency services staff provide medical attention to injured people on the south side of Westminster Bridge.
Conservative MP Tobias Ellwood, left, stands amongst the emergency services at the scene outside the Palace of Westminster, London, Wednesday, March 22, 2017.
"Foreign office minister Tobias Ellwood looking like he's sporting fresh blood."
"Parliament staff have been escorted to Westminster Abbey. Everyone's details will be taken."
Parliament member Barry Sheerman posted this photo from inside the lock-down.
People inside Parliament were being escorted out, wrote Twitter user Tim Kaplan when posting this photo.
Parliament member Barry Sheerman shared this photo showing Parliament members waiting while in lockdown.
Emergency services staff provide medical attention close to the Houses of Parliament in London, Wednesday, March 22, 2017.
Armed police officers gather outside of the Houses of Parliament in London, Wednesday, March 23, 2017.
Armed police officers enter the Houses of Parliament in London, Wednesday, March 23, 2017.
Emergency services staff provide medical attention close to the Houses of Parliament in London, Wednesday, March 22, 2017.
Police secure the area close to the Houses of Parliament in London, Wednesday, March 22, 201.
Emergency services staff provide medical attention close to the Houses of Parliament in London, Wednesday, March 22, 2017
Police secure the area close to the Houses of Parliament in London, Wednesday, March 22 following reports of violence.
Police secure the area close to the Houses of Parliament in London, Wednesday, March 22 following reports of violence.
Police secure the area close to the Houses of Parliament in London, Wednesday, March 22 following reports of violence.
Armed police officers enter the Houses of Parliament in London, Wednesday, March 23, 2017 after the
Armed police officers enter the Houses of Parliament in London, Wednesday, March 23 after the House of Commons sitting was suspended as witnesses reported sounds like gunfire.
An armed police officer stands on Parliament Square outside of the Houses of Parliament in London, Wednesday, March 23 after witnesses reported sounds like gunfire outside.
Police secure the area on the south side of Westminster Bridge close to the Houses of Parliament in London, Wednesday, March 22, 2017.
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PHOTOS: Fatal terror incident outside Parliament in LondonA man is treated by emergency services, as a knife lays on the floor, outside the Houses of Parliament London, Wednesday, March 22, 2017.
Stefan Rousseau/PA via AP

At least four people are dead at after a violent incident was reported at the Westminster Bridge near the Houses of Parliament in London on Wednesday. Police also reported a "number of casualties." The suspect is believed to be among the dead.

David Lidington, the leader of the House of Commons, addressed Parliament to say that a "police officer has been stabbed" and an "alleged assailant was shot by armed police." Witnesses reported hearing gunshots.

Officials also said there were reports of a person in the River Thames as well as a car that appeared to hit bystanders on the Westminster Bridge.

Paramedics were seen treating people at the scene. Officials declared the events to be a terror incident.

This is a developing story. Check back for updates.