London

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Family members of U.S. tourist Kurt Cochran, who was killed in Wednesday's London attack, and his wife Melissa, who was injured, attend a press conference at New Scotland Yard, the headquarters of London's Metropolitan Police force, in London, Monday, March 27, 2017. British police say that two people remain in custody following last week's attack in London as messaging services face criticism for encrypted networks that allow attackers to communicate in secret.(AP Photo/Matt Dunham)

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Michael Payne, left, the brother of U.S. tourist Melissa Cochran, who was injured and husband Kurt Cochran killed in Wednesday's London attack, holds hands with his wife Shantell Payne during a family members press conference at New Scotland Yard, the headquarters of London's Metropolitan Police force, in London, Monday, March 27, 2017. The family of an American man killed last week in the London attack has offered tribute to his generosity and say they are grateful for the help and support so many have shown during a horrible time. (AP Photo/Matt Dunham)

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Family members of U.S. tourist Kurt Cochran, who was killed in Wednesday's London attack, and his wife Melissa, who was injured, attend a press conference at New Scotland Yard, the headquarters of London's Metropolitan Police force, in London, Monday, March 27, 2017. British police say that two people remain in custody following last week's attack in London as messaging services face criticism for encrypted networks that allow attackers to communicate in secret.(AP Photo/Matt Dunham)

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FILE - In this Tuesday, March 29, 2011 file photo, former British athlete and head of the LOCOG, Sebastian Coe, right, speaks to former Namibian athlete and Chairman of the IOC Athletes' Commission Frank Fredericks in the London 2012 Olympic stadium, London. Under investigation by an Olympic ethics panel over a $300,000 payment he received, IAAF Council member Frank Fredericks has been urged by a colleague to step aside from the governing body’s work. European Athletics president Svein-Arne Hansen’s call to Fredericks on Wednesday, March 22, 2017 came three weeks before track and field’s ruling council meets in London under the chairmanship of IAAF President Sebastian Coe. (AP Photo/Tom Hevezi, file)

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People hold up a banner during a 'Unity Vigil' against racism and Islamophobia in reaction to Wednesday's attack, backdropped by the gates of Downing Street in London, Friday March 24, 2017. On Thursday authorities identified a 52-year-old Briton as the man who mowed down pedestrians and stabbed a policeman to death outside Parliament in London, saying he had a long criminal record and once was investigated for extremism — but was not currently on a terrorism watch list. (AP Photo/Matt Dunham)

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People look at floral tributes to victims of Wednesday's attack on Parliament Square outside the Houses of Parliament in London, Friday March 24, 2017. On Thursday authorities identified a 52-year-old Briton as the man who mowed down pedestrians and stabbed a policeman to death outside Parliament in London, saying he had a long criminal record and once was investigated for extremism — but was not currently on a terrorism watch list. (AP Photo/Matt Dunham)

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A police officer looks at floral tributes to victims of Wednesday's attack on Parliament Square outside the Houses of Parliament in London, Friday March 24, 2017. On Thursday authorities identified a 52-year-old Briton as the man who mowed down pedestrians and stabbed a policeman to death outside Parliament in London, saying he had a long criminal record and once was investigated for extremism — but was not currently on a terrorism watch list. (AP Photo/Matt Dunham)

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A police officer places flowers as a man gestures beside floral tributes to victims of Wednesday's attack, on Parliament Square outside the Houses of Parliament in London, Friday March 24, 2017. On Thursday authorities identified a 52-year-old Briton as the man who mowed down pedestrians and stabbed a policeman to death outside Parliament in London, saying he had a long criminal record and once was investigated for extremism — but was not currently on a terrorism watch list. (AP Photo/Matt Dunham)

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People look at floral tributes to victims of Wednesday's attack on Parliament Square outside the Houses of Parliament in London, Friday March 24, 2017. On Thursday authorities identified a 52-year-old Briton as the man who mowed down pedestrians and stabbed a policeman to death outside Parliament in London, saying he had a long criminal record and once was investigated for extremism — but was not currently on a terrorism watch list. (AP Photo/Matt Dunham)

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Floral tributes to victims of Wednesday's attack outside the Houses of Parliament in London, Friday March 24, 2017. On Thursday authorities identified a 52-year-old Briton as the man who mowed down pedestrians and stabbed a policeman to death outside Parliament in London, saying he had a long criminal record and once was investigated for extremism — but was not currently on a terrorism watch list. (AP Photo/Tim Ireland)

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People view floral tributes to victims of Wednesday's attack outside the Houses of Parliament in London, Friday, March 24, 2017. On Thursday authorities identified a 52-year-old Briton as the man who mowed down pedestrians and stabbed a policeman to death outside Parliament in London, saying he had a long criminal record and once was investigated for extremism — but was not currently on a terrorism watch list. (AP Photo/Tim Ireland)

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Floral tributes to victims of Wednesday's attack outside the Houses of Parliament in London, Friday March 24, 2017. On Thursday authorities identified a 52-year-old Briton as the man who mowed down pedestrians and stabbed a policeman to death outside Parliament in London, saying he had a long criminal record and once was investigated for extremism — but was not currently on a terrorism watch list. (AP Photo/Tim Ireland)

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People view floral tributes to victims of Wednesday's attack outside the Houses of Parliament in London, Friday, March 24, 2017. On Thursday authorities identified a 52-year-old Briton as the man who mowed down pedestrians and stabbed a policeman to death outside Parliament in London, saying he had a long criminal record and once was investigated for extremism but was not currently on a terrorism watch list. (AP Photo/Tim Ireland)

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London Mayor Sadiq Khan looks at floral tributes to victims of Wednesday's attack outside the Houses of Parliament in London, Friday March 24, 2017. On Thursday authorities identified a 52-year-old Briton as the man who mowed down pedestrians and stabbed a policeman to death outside Parliament in London, saying he had a long criminal record and once was investigated for extremism — but was not currently on a terrorism watch list. (AP Photo/Matt Dunham)

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London Mayor Sadiq Khan stands on Westminster Bridge near floral tributes to victims of Wednesday's attack outside the Houses of Parliament in London, Friday March 24, 2017. (AP Photo/Matt Dunham)

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London Mayor Sadiq Khan talks with a police officer outside the Houses of Parliament in London, Friday March 24, 2017. On Thursday authorities identified a 52-year-old Briton as the man who mowed down pedestrians and stabbed a policeman to death outside Parliament in London, saying he had a long criminal record and once was investigated for extremism — but was not currently on a terrorism watch list. (AP Photo/Matt Dunham)

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Flowers for the victims of Wednesday's attack are placed in a gate outside the Houses of Parliament in London, Friday March 24, 2017. On Thursday authorities identified a 52-year-old Briton as the man who mowed down pedestrians and stabbed a policeman to death outside Parliament in London, saying he had a long criminal record and once was investigated for extremism — but was not currently on a terrorism watch list. (AP Photo/Matt Dunham)

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Police officers patrol on Westminster Bridge in London, Friday March 24, 2017. On Thursday authorities identified a 52-year-old Briton as the man who mowed down pedestrians and stabbed a policeman to death outside Parliament in London, saying he had a long criminal record and once was investigated for extremism — but was not currently on a terrorism watch list. (AP Photo/Matt Dunham)

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Floral tributes to victims of Wednesday's attack are tied to a lamppost outside the Houses of Parliament in London, Friday March 24, 2017. On Thursday authorities identified a 52-year-old Briton as the man who mowed down pedestrians and stabbed a policeman to death outside Parliament in London, saying he had a long criminal record and once was investigated for extremism — but was not currently on a terrorism watch list. (AP Photo/Matt Dunham)

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