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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