In pictures: Britain's Houses of Parliament attack

Scotland Yard report they have been called to an incident on Westminster Bridge where several people have been injured by a car.
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Armed police officer stand guard near Westminster Bridge and the Houses of Parliament 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. (Getty Images)
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Emergency services vehicles seen on Westminster Bridge in London, England. (Getty Images)
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Emergency services make their way down the river in London, England. (Getty Images)
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Emergency services seen on Westminster Bridge in London, England. (Getty Images)
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London's air ambulance arrives at the Houses of Parliament in central London during an emergency incident. Britain's Houses of Parliament were in lockdown on Wednesday after staff said they heard shots fired, triggering a security alert. (DANIEL LEAL-OLIVAS/AFP/Getty Images)
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A member of the public is loaded into an ambulance by emergency services near Westminster Bridge and the Houses of Parliament in London, England. (Getty Images)
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A Police boat patrols the river Thames by St Thomas' hospital and Westminster Bridge in London, England. (Getty Images)
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People leave after being evacuated from the Houses of Parliament in central London during an emergency incident. (DANIEL LEAL-OLIVAS/AFP/Getty Images)
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Armed police officers carry their weapons as forensics officers work near a grey vehicle that crashed into the railings of the Houses of Parliament in central London 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. (DANIEL LEAL-OLIVAS/AFP/Getty Images)