London

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A singles white rose, a tribute to the victims of Wednesday's attack, is placed near the Houses of Parliament in London, Thursday March 23, 2017. On Wednesday a knife-wielding man went on a deadly rampage, first driving a car into pedestrians then stabbing a police officer to death before being fatally shot by police within Parliament's grounds in London. (AP Photo/Tim Ireland)

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Floral tributes to the victims of Wednesday's attack, is placed near the Houses of Parliament in London, Thursday March 23, 2017. On Wednesday a knife-wielding man went on a deadly rampage, first driving a car into pedestrians then stabbing a police officer to death before being fatally shot by police within Parliament's grounds in London. (AP Photo/Tim Ireland)

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Italian boxing coach and former Olympic Gold medalist Maurizio Stecca speaks to the Associated Press in London, Thursday March 23, 2017. Stecca was visiting the Houses of Parliament on Wednesday when a man went on a deadly rampage, first driving a car into pedestrians then stabbing a police officer to death before being fatally shot by police within Parliament's grounds in London. (AP Photo/Sophie Berman)

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Italian boxing coach and former Olympic Gold medalist Maurizio Stecca speaks to the Associated Press about yesterday's attack events in London, Thursday March 23, 2017. Stecca was visiting the Houses of Parliament on Wednesday when a man went on a deadly rampage, first driving a car into pedestrians then stabbing a police officer to death before being fatally shot by police within Parliament's grounds in London. (AP Photo/Sophie Berman)

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Police forensic officers in Parliament Square examine the area outside the Houses of Parliament in London, Thursday March 23, 2017. On Wednesday a knife-wielding man went on a deadly rampage, first driving a car into pedestrians then stabbing a police officer to death before being fatally shot by police within Parliament's grounds in London. (Dominic Lipinsk/PA via AP)

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Police forensic officers work in Parliament Square outside the Houses of Parliament in London, Thursday March 23, 2017. On Wednesday a knife-wielding man went on a deadly rampage, first driving a car into pedestrians then stabbing a police officer to death before being fatally shot by police within Parliament's grounds in London. (AP Photo/Kirsty Wigglesworth)

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Flowers and a photo of killed police officer Keith Palmer on Whitehall near the Houses of Parliament in London, Thursday March 23, 2017. On Wednesday a knife-wielding man went on a deadly rampage, first driving a car into pedestrians then stabbing a police officer to death before being fatally shot by police within Parliament's grounds in London. (AP Photo/Kirsty Wigglesworth)

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A police officer and support officer on patrol speak to a Yeoman Warder of the Tower of London, known as a Beefeater, at the Tower of London, a popular tourist attraction in London, Thursday, March 23, 2017. On Wednesday a man went on a deadly rampage, first driving a car into pedestrians then stabbing a police officer to death before being fatally shot by police within Parliament's grounds in London. (AP Photo/Matt Dunham)

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A woman collecting money for charity stands next to a quote written on an information board at Tower Hill underground train station, written in defiance of the previous day's attack in London, Thursday, in this March 23, 2017, file photo. On Wednesday, a man went on a deadly rampage, first driving a car into pedestrians then stabbing a police officer to death before being fatally shot by police within Parliament's grounds in London. (AP Photo/Matt Dunham) ** FILE **

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Police forensic officers work in Parliament Square overseen by the statue of Winston Churchill outside the Houses of Parliament in London, Thursday March 23, 2017. On Wednesday a knife-wielding man went on a deadly rampage, first driving a car into pedestrians then stabbing a police officer to death before being fatally shot by police within Parliament's grounds in London. (AP Photo/Kirsty Wigglesworth)

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A police officer stands on Westminster Bridge with the Houses of Parliament in background, in London, Thursday March 23, 2017. On Wednesday a knife-wielding man went on a deadly rampage, first driving a car into pedestrians on Westminster Bridge then stabbing a police officer to death before being fatally shot by police within Parliament's grounds in London. (AP Photo/Tim Ireland)

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Flowers and a photo of killed police officer Keith Palmer on Whitehall near the Houses of Parliament in London, Thursday March 23, 2017. On Wednesday a knife-wielding man went on a deadly rampage, first driving a car into pedestrians then stabbing a police officer to death before being fatally shot by police within Parliament's grounds in London. (AP Photo/Kirsty Wigglesworth)

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Police work at Westminster Bridge with the Houses of Parliament in background, in London, Thursday March 23, 2017. On Wednesday a knife-wielding man went on a deadly rampage, first driving a car into pedestrians on Westminster Bridge then stabbing a police officer to death before being fatally shot by police within Parliament's grounds in London. (AP Photo/Tim Ireland)

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Flowers and a photo of killed police officer Keith Palmer on Whitehall near the Houses of Parliament in London, Thursday March 23, 2017. On Wednesday a knife-wielding man went on a deadly rampage, first driving a car into pedestrians then stabbing a police officer to death before being fatally shot by police within Parliament's grounds in London. (Dominic Lipinski/PA via AP)

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A police officer places flowers and a photo of fellow police officer Keith Palmer, who was killed in yesterdays attack, on Whitehall near the Houses of Parliament in London, Thursday March 23, 2017. On Wednesday a knife-wielding man went on a deadly rampage, first driving a car into pedestrians then stabbing a police officer to death before being fatally shot by police within Parliament's grounds in London. (Dominic Lipinski/PA via AP)

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Police work at Westminster Bridge with the Houses of Parliament in background, in London, Thursday March 23, 2017. On Wednesday a knife-wielding man went on a deadly rampage, first driving a car into pedestrians on Westminster Bridge then stabbing a police officer to death before being fatally shot by police within Parliament's grounds in London. (AP Photo/Tim Ireland)

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Police work at Westminster Bridge with the Houses of Parliament in background, in London, Thursday March 23, 2017. On Wednesday a knife-wielding man went on a deadly rampage, first driving a car into pedestrians on Westminster Bridge then stabbing a police officer to death before being fatally shot by police within Parliament's grounds in London. (AP Photo/Tim Ireland)

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Britain's Prime Minister Theresa May speaks in the Houses of Parliament, Thursday March 23, 2017, following the attack in London Wednesday. On Wednesday a man went on a deadly rampage, first drove a car into pedestrians then stabbed a police officer to death before being fatally shot by police within Parliament's grounds in London. (PA via AP)

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A forensics tent on Westminster Bridge is seen from Victoria Embankment in London, the day after an attacker killed people before being fatally shot by police within Parliament's grounds Thursday March 23, 2017. A knife-wielding man went on a deadly rampage in the heart of Britain's seat of power Wednesday, plowing a car into pedestrians on London's Westminster Bridge before stabbing a police officer to death inside the gates of Parliament. (Jonathan Brady/PA via AP)

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People look at a newspaper stand showing papers with coverage of Wednesday's attack in London, Thursday March 23, 2017. On Wednesday a knife-wielding man went on a deadly rampage, first driving a car into pedestrians before stabbing a police officer to death and then was fatally shot by police within Parliament's grounds in London. Five people were killed, including the assailant.(AP Photo/Kirsty Wigglesworth)