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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