Photos: The London attack

Police secure the area on the south side of Westminster Bridge close to the Houses of Parliament in London, Wednesday, March 22, 2017. The leader of Britain’s House of Commons says a man has been shot by police at Parliament. David Liddington also said there were “reports of further violent incidents in the vicinity.” London’s police said officers had been called to a firearms incident on Westminster Bridge, near the parliament. Britain’s MI5 says it is too early to say if the incident is terror-related. (AP Photo/Matt Dunham)
An Air Ambulance on the scene after sounds similar to gunfire have been heard close to the Houses of Parliament, London, Wednesday, March 22, 2017. The UK House of Commons sitting has been suspended as witnesses report sounds like gunfire outside. (Victoria Jones/PA via AP)
LONDON, ENGLAND - MARCH 22: Armed police officer stand guard near Westminster Bridge and the Houses of Parliament on March 22, 2017 in London, England. A police officer has been stabbed near to the British Parliament and the alleged assailant shot by armed police. Scotland Yard report they have been called to an incident on Westminster Bridge where several people have been injured by a car. (Photo by Jack Taylor/Getty Images)
LONDON, ENGLAND – MARCH 22: Armed police officer stand guard near Westminster Bridge and the Houses of Parliament on March 22, 2017 in London, England. A police officer has been stabbed near to the British Parliament and the alleged assailant shot by armed police. Scotland Yard report they have been called to an incident on Westminster Bridge where several people have been injured by a car. (Photo by Jack Taylor/Getty Images)
LONDON, ENGLAND - MARCH 22: An armed police officer stands guard near Westminster Bridge and the Houses of Parliament on March 22, 2017 in London, England. A police officer has been stabbed near to the British Parliament and the alleged assailant shot by armed police. Scotland Yard report they have been called to an incident on Westminster Bridge where several people have been injured by a car. (Photo by Jack Taylor/Getty Images)
LONDON, ENGLAND – MARCH 22: An armed police officer stands guard near Westminster Bridge and the Houses of Parliament on March 22, 2017 in London, England. A police officer has been stabbed near to the British Parliament and the alleged assailant shot by armed police. Scotland Yard report they have been called to an incident on Westminster Bridge where several people have been injured by a car. (Photo by Jack Taylor/Getty Images)
LONDON, ENGLAND - MARCH 22:  Commander BJ Harrington of the Metropolitan Police makes a statement outside of New Scotland Yard on March 22, 2017 in London, England.  A police officer has been stabbed near to the British Parliament and the alleged assailant shot by armed police. Scotland Yard report they have been called to an incident on Westminster Bridge where several people have been injured by a car.  (Photo by Jack Taylor/Getty Images)
LONDON, ENGLAND – MARCH 22: Commander BJ Harrington of the Metropolitan Police makes a statement outside of New Scotland Yard on March 22, 2017 in London, England. A police officer has been stabbed near to the British Parliament and the alleged assailant shot by armed police. Scotland Yard report they have been called to an incident on Westminster Bridge where several people have been injured by a car. (Photo by Jack Taylor/Getty Images)
LONDON, ENGLAND - MARCH 22:  Ambulances, police vehicles and emergency services seen on Westminster Bridge on March 22, 2017 in London, England. A police officer was stabbed near to the British Parliament and the alleged assailant shot by armed police. Scotland Yard also reported an incident on Westminster Bridge where one woman has been killed and several people seriously injured by a car.  (Photo by Carl Court/Getty Images)
LONDON, ENGLAND – MARCH 22: Ambulances, police vehicles and emergency services seen on Westminster Bridge on March 22, 2017 in London, England. A police officer was stabbed near to the British Parliament and the alleged assailant shot by armed police. Scotland Yard also reported an incident on Westminster Bridge where one woman has been killed and several people seriously injured by a car. (Photo by Carl Court/Getty Images)
Police on the scene after sounds similar to gunfire have been heard close to the Houses of Parliament, London, Wednesday, March 22, 2017. The UK House of Commons sitting has been suspended as witnesses report sounds like gunfire outside. (Victoria Jones/PA via AP)
Emergency services staff provide medical attention close to the Houses of Parliament in London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. There are also reports of a vehicle hitting pedestrians on nearby Westminster Bridge. (AP Photo/Matt Dunham)
LONDON, ENGLAND - MARCH 22:  Ambulances, police vehicles and emergency services seen on Westminster Bridge on March 22, 2017 in London, England. A police officer was stabbed near to the British Parliament and the alleged assailant shot by armed police. Scotland Yard also reported an incident on Westminster Bridge where one woman has been killed and several people seriously injured by a car.  (Photo by Carl Court/Getty Images)
LONDON, ENGLAND – MARCH 22: Ambulances, police vehicles and emergency services seen on Westminster Bridge on March 22, 2017 in London, England. A police officer was stabbed near to the British Parliament and the alleged assailant shot by armed police. Scotland Yard also reported an incident on Westminster Bridge where one woman has been killed and several people seriously injured by a car. (Photo by Carl Court/Getty Images)
Emergency personnel close to the Palace of Westminster, London, Wednesday, March 22, 2017, after London police say officers called to a ‘firearms incident’ on Westminster Bridge, near Parliament. The leader of Britain’s House of Commons says a man has been shot by police at Parliament. David Liddington also said there were “reports of further violent incidents in the vicinity.” London’s police said officers had been called to a firearms incident on Westminster Bridge, near the parliament. Britain’s MI5 says it is too early to say if the incident is terror-related. . (Yui Mok/PA via AP)
Roads are closed off by police after sounds similar to gunfire have been heard close to the Houses of Parliament, London, Wednesday, March 22, 2017. The UK House of Commons sitting has been suspended as witnesses report sounds like gunfire outside. (Victoria Jones/PA via AP)
Police secure the area close to the Houses of Parliament in London, Wednesday, March 22, 2017. The leader of Britain’s House of Commons says a man has been shot by police at Parliament. David Liddington also said there were “reports of further violent incidents in the vicinity.” London’s police said officers had been called to a firearms incident on Westminster Bridge, near the parliament. Britain’s MI5 says it is too early to say if the incident is terror-related. (AP Photo/Matt Dunham)
An armed police officer stands on Parliament Square outside of the Houses of Parliament in London, Wednesday, March 23, 2017 after the House of Commons sitting was suspended as witnesses reported sounds like gunfire outside. (AP Photo/Kirsty Wigglesworth)
Police on the scene after sounds similar to gunfire have been heard close to the Houses of Parliament, London, Wednesday, March 22, 2017. The UK House of Commons sitting has been suspended as witnesses report sounds like gunfire outside. (Victoria Jones/PA via AP)
Police on the scene after sounds similar to gunfire have been heard close to the Houses of Parliament, London, Wednesday, March 22, 2017. London police say officers called to ‘firearms incident’ on Westminster Bridge, near Parliament. (Victoria Jones/PA via AP)
Emergency services at the scene outside the Palace of Westminster, London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge. . (Stefan Rousseau/PA via AP)
Emergency services transport an injured person to an ambulance, close to the Houses of Parliament in London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” The Metropolitan Police says in a statement that the incident is ongoing. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge. (AP Photo/Matt Dunham)
Emergency services transport an injured person to an ambulance, close to the Houses of Parliament in London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” The Metropolitan Police says in a statement that the incident is ongoing. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge. (AP Photo/Matt Dunham)
Police secure the area on the south side of Westminster Bridge close to the Houses of Parliament in London, Wednesday, March 22, 2017. The leader of Britain’s House of Commons says a man has been shot by police at Parliament. David Liddington also said there were “reports of further violent incidents in the vicinity.” London’s police said officers had been called to a firearms incident on Westminster Bridge, near the parliament. Britain’s MI5 says it is too early to say if the incident is terror-related. (AP Photo/Matt Dunham)
Armed police officers enter the Houses of Parliament in London, Wednesday, March 23, 2017 after the House of Commons sitting was suspended as witnesses reported sounds like gunfire outside. (AP Photo/Kirsty Wigglesworth)
Armed police officers gather outside of the Houses of Parliament in London, Wednesday, March 23, 2017 after the House of Commons sitting was suspended as witnesses reported sounds like gunfire outside. The leader of Britain’s House of Commons says a man has been shot by police at Parliament. David Liddington also said there were “reports of further violent incidents in the vicinity.” (AP Photo/Kirsty Wigglesworth)
Police secure the area close to the Houses of Parliament in London, Wednesday, March 22, 2017. The leader of Britain’s House of Commons says a man has been shot by police at Parliament. David Liddington also said there were “reports of further violent incidents in the vicinity.” London’s police said officers had been called to a firearms incident on Westminster Bridge, near the parliament. Britain’s MI5 says it is too early to say if the incident is terror-related. (AP Photo/Matt Dunham)
Emergency personnel tend to an injured person close to the Palace of Westminster, London, Wednesday, March 22, 2017.  London police say officers called to a 'firearms incident' on Westminster Bridge, near Parliament. The leader of Britain's House of Commons says a man has been shot by police at Parliament. David Liddington also said there were "reports of further violent incidents in the vicinity."  Britain's MI5 says it is too early to say if the incident is terror-related. (Yui Mok/PA via AP).
Emergency personnel tend to an injured person close to the Palace of Westminster, London, Wednesday, March 22, 2017. London police say officers called to a ‘firearms incident’ on Westminster Bridge, near Parliament. The leader of Britain’s House of Commons says a man has been shot by police at Parliament. David Liddington also said there were “reports of further violent incidents in the vicinity.” Britain’s MI5 says it is too early to say if the incident is terror-related. . (Yui Mok/PA via AP)
Emergency services work at the scene of a crashed car close to the Houses of Parliament, London, Wednesday, March 22, 2017. London police say officers called to 'firearms incident' on Westminster Bridge, near Parliament. The leader of Britain's House of Commons says a man has been shot by police at Parliament. David Liddington also said there were "reports of further violent incidents in the vicinity."  London's police said officers had been called to a firearms incident on Westminster Bridge, near the parliament. Britain's MI5 says it is too early to say if the incident is terror-related.(Yui Mok/PA via AP)
Emergency services work at the scene of a crashed car close to the Houses of Parliament, London, Wednesday, March 22, 2017. London police say officers called to ‘firearms incident’ on Westminster Bridge, near Parliament. The leader of Britain’s House of Commons says a man has been shot by police at Parliament. David Liddington also said there were “reports of further violent incidents in the vicinity.” London’s police said officers had been called to a firearms incident on Westminster Bridge, near the parliament. Britain’s MI5 says it is too early to say if the incident is terror-related. (Yui Mok/PA via AP)
A police officer is led away by a colleague at the scene outside the Palace of Westminster, London, Wednesday, March 22, 2017.  London police say they are treating a gun and knife incident at Britain's Parliament "as a terrorist incident until we know otherwise." The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge.  (Stefan Rousseau/PA via AP).
A police officer is led away by a colleague at the scene outside the Palace of Westminster, London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge. . (Stefan Rousseau/PA via AP)
Conservative MP Tobias Ellwood, centre, stands amongst the emergency services at the scene outside the Palace of Westminster, London, Wednesday, March 22, 2017.  London police say they are treating a gun and knife incident at Britain's Parliament "as a terrorist incident until we know otherwise." The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge.  (Stefan Rousseau/PA via AP).
Conservative MP Tobias Ellwood, centre, stands amongst the emergency services at the scene outside the Palace of Westminster, London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge. . (Stefan Rousseau/PA via AP)
A man is treated by emergency services  as police look on at the scene outside the Houses of Parliament London, Wednesday, March 22, 2017.  London police say they are treating a gun and knife incident at Britain's Parliament "as a terrorist incident until we know otherwise." The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge.  (Stefan Rousseau/PA via AP).
A man is treated by emergency services as police look on at the scene outside the Houses of Parliament London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge. . (Stefan Rousseau/PA via AP)
Emergency services at the scene outside the Palace of Westminster, London, Wednesday, March 22, 2017.  London police say they are treating a gun and knife incident at Britain's Parliament "as a terrorist incident until we know otherwise." The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge.  (Stefan Rousseau/PA via AP).
Emergency services at the scene outside the Palace of Westminster, London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge. . (Stefan Rousseau/PA via AP)
A policeman points a gun at a man on the floor as emergency services attend the scene outside the Palace of Westminster, London, Wednesday, March 22, 2017.  London police say they are treating a gun and knife incident at Britain's Parliament "as a terrorist incident until we know otherwise." The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge.  (Stefan Rousseau/PA via AP).
A policeman points a gun at a man on the floor as emergency services attend the scene outside the Palace of Westminster, London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge. . (Stefan Rousseau/PA via AP)
Armed police at the scene outside the Palace of Westminster, London, Wednesday, March 22, 2017.  London police say they are treating a gun and knife incident at Britain's Parliament "as a terrorist incident until we know otherwise." The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge.  (Yui Mok/PA via AP).
Armed police at the scene outside the Palace of Westminster, London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge. . (Yui Mok/PA via AP)
Emergency personnel tend to an injured person close to the Palace of Westminster, London, Wednesday, March 22, 2017.  London police say officers called to a 'firearms incident' on Westminster Bridge, near Parliament. The leader of Britain's House of Commons says a man has been shot by police at Parliament. David Liddington also said there were "reports of further violent incidents in the vicinity."  London's police said officers had been called to a firearms incident on Westminster Bridge, near the parliament. Britain's MI5 says it is too early to say if the incident is terror-related. (Yui Mok/PA via AP).
Emergency personnel tend to an injured person close to the Palace of Westminster, London, Wednesday, March 22, 2017. London police say officers called to a ‘firearms incident’ on Westminster Bridge, near Parliament. The leader of Britain’s House of Commons says a man has been shot by police at Parliament. David Liddington also said there were “reports of further violent incidents in the vicinity.” London’s police said officers had been called to a firearms incident on Westminster Bridge, near the parliament. Britain’s MI5 says it is too early to say if the incident is terror-related. . (Yui Mok/PA via AP)
Armed police officers enter the Houses of Parliament in London, Wednesday, March 23, 2017 after the House of Commons sitting was suspended as witnesses reported sounds like gunfire outside. The leader of Britain’s House of Commons says a man has been shot by police at Parliament. David Liddington also said there were “reports of further violent incidents in the vicinity.” (AP Photo/Kirsty Wigglesworth)
Emergency personnel tend to an injured person close to the Palace of Westminster, London, Wednesday, March 22, 2017. London police say officers called to a ‘firearms incident’ on Westminster Bridge, near Parliament. The leader of Britain’s House of Commons says a man has been shot by police at Parliament. David Liddington also said there were “reports of further violent incidents in the vicinity.” London’s police said officers had been called to a firearms incident on Westminster Bridge, near the parliament. Britain’s MI5 says it is too early to say if the incident is terror-related. . (Yui Mok/PA via AP)
Emergency services staff provide medical attention close to the Houses of Parliament in London, Wednesday, March 22, 2017. London police say they are treating a gun and knife incident at Britain’s Parliament “as a terrorist incident until we know otherwise.” The Metropolitan Police says in a statement that the incident is ongoing. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge. (AP Photo/Matt Dunham)
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LONDON, ENGLAND - MARCH 22: Armed police officer stand guard near Westminster Bridge and the Houses of Parliament on March 22, 2017 in London, England. A police officer has been stabbed near to the British Parliament and the alleged assailant shot by armed police. Scotland Yard report they have been called to an incident on Westminster Bridge where several people have been injured by a car. (Photo by Jack Taylor/Getty Images)
LONDON, ENGLAND - MARCH 22: An armed police officer stands guard near Westminster Bridge and the Houses of Parliament on March 22, 2017 in London, England. A police officer has been stabbed near to the British Parliament and the alleged assailant shot by armed police. Scotland Yard report they have been called to an incident on Westminster Bridge where several people have been injured by a car. (Photo by Jack Taylor/Getty Images)
LONDON, ENGLAND - MARCH 22:  Commander BJ Harrington of the Metropolitan Police makes a statement outside of New Scotland Yard on March 22, 2017 in London, England.  A police officer has been stabbed near to the British Parliament and the alleged assailant shot by armed police. Scotland Yard report they have been called to an incident on Westminster Bridge where several people have been injured by a car.  (Photo by Jack Taylor/Getty Images)
LONDON, ENGLAND - MARCH 22:  Ambulances, police vehicles and emergency services seen on Westminster Bridge on March 22, 2017 in London, England. A police officer was stabbed near to the British Parliament and the alleged assailant shot by armed police. Scotland Yard also reported an incident on Westminster Bridge where one woman has been killed and several people seriously injured by a car.  (Photo by Carl Court/Getty Images)
LONDON, ENGLAND - MARCH 22:  Ambulances, police vehicles and emergency services seen on Westminster Bridge on March 22, 2017 in London, England. A police officer was stabbed near to the British Parliament and the alleged assailant shot by armed police. Scotland Yard also reported an incident on Westminster Bridge where one woman has been killed and several people seriously injured by a car.  (Photo by Carl Court/Getty Images)
Emergency personnel tend to an injured person close to the Palace of Westminster, London, Wednesday, March 22, 2017.  London police say officers called to a 'firearms incident' on Westminster Bridge, near Parliament. The leader of Britain's House of Commons says a man has been shot by police at Parliament. David Liddington also said there were "reports of further violent incidents in the vicinity."  Britain's MI5 says it is too early to say if the incident is terror-related. (Yui Mok/PA via AP).
Emergency services work at the scene of a crashed car close to the Houses of Parliament, London, Wednesday, March 22, 2017. London police say officers called to 'firearms incident' on Westminster Bridge, near Parliament. The leader of Britain's House of Commons says a man has been shot by police at Parliament. David Liddington also said there were "reports of further violent incidents in the vicinity."  London's police said officers had been called to a firearms incident on Westminster Bridge, near the parliament. Britain's MI5 says it is too early to say if the incident is terror-related.(Yui Mok/PA via AP)
A police officer is led away by a colleague at the scene outside the Palace of Westminster, London, Wednesday, March 22, 2017.  London police say they are treating a gun and knife incident at Britain's Parliament "as a terrorist incident until we know otherwise." The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge.  (Stefan Rousseau/PA via AP).
Conservative MP Tobias Ellwood, centre, stands amongst the emergency services at the scene outside the Palace of Westminster, London, Wednesday, March 22, 2017.  London police say they are treating a gun and knife incident at Britain's Parliament "as a terrorist incident until we know otherwise." The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge.  (Stefan Rousseau/PA via AP).
A man is treated by emergency services  as police look on at the scene outside the Houses of Parliament London, Wednesday, March 22, 2017.  London police say they are treating a gun and knife incident at Britain's Parliament "as a terrorist incident until we know otherwise." The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge.  (Stefan Rousseau/PA via AP).
Emergency services at the scene outside the Palace of Westminster, London, Wednesday, March 22, 2017.  London police say they are treating a gun and knife incident at Britain's Parliament "as a terrorist incident until we know otherwise." The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge.  (Stefan Rousseau/PA via AP).
A policeman points a gun at a man on the floor as emergency services attend the scene outside the Palace of Westminster, London, Wednesday, March 22, 2017.  London police say they are treating a gun and knife incident at Britain's Parliament "as a terrorist incident until we know otherwise." The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge.  (Stefan Rousseau/PA via AP).
Armed police at the scene outside the Palace of Westminster, London, Wednesday, March 22, 2017.  London police say they are treating a gun and knife incident at Britain's Parliament "as a terrorist incident until we know otherwise." The Metropolitan Police says in a statement that the incident is ongoing. It is urging people to stay away from the area. Officials say a man with a knife attacked a police officer at Parliament and was shot by officers. Nearby, witnesses say a vehicle struck several people on the Westminster Bridge.  (Yui Mok/PA via AP).
Emergency personnel tend to an injured person close to the Palace of Westminster, London, Wednesday, March 22, 2017.  London police say officers called to a 'firearms incident' on Westminster Bridge, near Parliament. The leader of Britain's House of Commons says a man has been shot by police at Parliament. David Liddington also said there were "reports of further violent incidents in the vicinity."  London's police said officers had been called to a firearms incident on Westminster Bridge, near the parliament. Britain's MI5 says it is too early to say if the incident is terror-related. (Yui Mok/PA via AP).

WASHINGTON — Photos of the attack in London March 22, 2017.

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