Trafalgar Square

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People light candles at a vigil for the victims of Wednesday's attack, at Trafalgar Square in London, Thursday, March 23, 2017. The Islamic State group has claimed responsibility for an attack by a man who plowed an SUV into pedestrians and then stabbed a police officer to death on the grounds of Britain's Parliament. Mayor Sadiq Khan called for Londoners to attend a candlelit vigil at Trafalgar Square on Thursday evening in solidarity with the victims and their families and to show that London remains united. (AP Photo/Matt Dunham)

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People light candles at a vigil for the victims of Wednesday's attack, at Trafalgar Square in London, Thursday, March 23, 2017. The Islamic State group has claimed responsibility for an attack by a man who plowed an SUV into pedestrians and then stabbed a police officer to death on the grounds of Britain's Parliament. Mayor Sadiq Khan called for Londoners to attend a candlelit vigil at Trafalgar Square on Thursday evening in solidarity with the victims and their families and to show that London remains united. (AP Photo/Matt Dunham)

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A group of nuns light candles at a vigil for the victims of Wednesday's attack, at Trafalgar Square in London, Thursday, March 23, 2017. The Islamic State group has claimed responsibility for an attack by a man who plowed an SUV into pedestrians and then stabbed a police officer to death on the grounds of Britain's Parliament. Mayor Sadiq Khan called for Londoners to attend a candlelit vigil at Trafalgar Square on Thursday evening in solidarity with the victims and their families and to show that London remains united. (AP Photo/Matt Dunham)

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Crowds gather at a vigil for the victims of Wednesday's attack, at Trafalgar Square in London, Thursday, March 23, 2017. The Islamic State group has claimed responsibility for an attack by a man who plowed an SUV into pedestrians and then stabbed a police officer to death on the grounds of Britain's Parliament. Mayor Sadiq Khan called for Londoners to attend a candlelit vigil at Trafalgar Square on Thursday evening in solidarity with the victims and their families and to show that London remains united. (AP Photo/Matt Dunham)

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People light candles at a vigil for the victims of Wednesday's attack, at Trafalgar Square in London, Thursday, March 23, 2017. The Islamic State group has claimed responsibility for an attack by a man who plowed an SUV into pedestrians and then stabbed a police officer to death on the grounds of Britain's Parliament. Mayor Sadiq Khan called for Londoners to attend a candlelit vigil at Trafalgar Square on Thursday evening in solidarity with the victims and their families and to show that London remains united. (AP Photo/Matt Dunham)

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People observe a minutes silence at a vigil for the victims of Wednesday's attack, at Trafalgar Square in London, Thursday, March 23, 2017. The Islamic State group has claimed responsibility for an attack by a man who plowed an SUV into pedestrians and then stabbed a police officer to death on the grounds of Britain's Parliament. Mayor Sadiq Khan called for Londoners to attend a candlelit vigil at Trafalgar Square on Thursday evening in solidarity with the victims and their families and to show that London remains united. (AP Photo/Matt Dunham)

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People light candles at a vigil for the victims of Wednesday's attack, at Trafalgar Square in London, Thursday, March 23, 2017. The Islamic State group has claimed responsibility for an attack by a man who plowed an SUV into pedestrians and then stabbed a police officer to death on the grounds of Britain's Parliament. Mayor Sadiq Khan called for Londoners to attend a candlelit vigil at Trafalgar Square on Thursday evening in solidarity with the victims and their families and to show that London remains united. (AP Photo/Matt Dunham)

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A woman holds up a sign at a vigil for the victims of Wednesday's attack, at Trafalgar Square in London, Thursday, March 23, 2017. The Islamic State group has claimed responsibility for an attack by a man who plowed an SUV into pedestrians and then stabbed a police officer to death on the grounds of Britain's Parliament. Mayor Sadiq Khan called for Londoners to attend a candlelit vigil at Trafalgar Square on Thursday evening in solidarity with the victims and their families and to show that London remains united. (AP Photo/Matt Dunham)

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Actors Emily Blunt and Tom Cruise at a photocall for their new film Edge of Tomorrow, where a part is being filmed in Trafalgar Square, background, in London, Sunday, May 25, 2014. Nelson's Column is at right, the National Gallery is at left, (AP Photo / John Stillwell/PA) UNITED KINGDOM OUT