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Ambulances wait as members of the emergency services work on Westminster Bridge, alongside the Houses of Parliament in central London on March 22, 2017, during an emergency incident.
British police shot a suspected attacker outside the Houses of Parliament in London on Wednesday after an officer was stabbed in what police said was a "terrorist" incident. One woman has died and others have "catastrophic" injuries following a suspected terror attack outside the British parliament, local media reported on Wednesday citing a junior doctor. / AFP PHOTO / NIKLAS HALLE'N        (Photo credit should read NIKLAS HALLE'N/AFP/Getty Images)
Ambulances wait as members of the emergency services work on Westminster Bridge, alongside the Houses of Parliament in central London on March 22, 2017, during an emergency incident.
British police shot a suspected attacker outside the Houses of Parliament in London on Wednesday after an officer was stabbed in what police said was a "terrorist" incident. One woman has died and others have "catastrophic" injuries following a suspected terror attack outside the British parliament, local media reported on Wednesday citing a junior doctor. / AFP PHOTO / NIKLAS HALLE'N        (Photo credit should read NIKLAS HALLE'N/AFP/Getty Images)

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    London attack: Watch how it unfolded

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London attack: Watch how it unfolded

Four people died and about 40 were injured when an attacker rammed a car into crowds of people before stabbing a police officer in the grounds of the UK Parliament in London.

London attack: Watch how it unfolded

Four people died and about 40 were injured when an attacker rammed a car into crowds of people before stabbing a police officer in the grounds of the UK Parliament in London.