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LONDON, ENGLAND - MARCH 22:  A member of the public is treated by emergency services 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 Carl Court/Getty Images)
LONDON, ENGLAND - MARCH 22:  A member of the public is treated by emergency services 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 Carl Court/Getty Images)

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    Police: 4 dead in London attack

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Police: 4 dead in London attack

British police say the London Parliament attacker killed 4 people before being killed himself as they provide an update on the investigation.

Police: 4 dead in London attack

British police say the London Parliament attacker killed 4 people before being killed himself as they provide an update on the investigation.