A woman in the crowd listens as London Mayor Sadiq Khan addresses those gathered for a candlelight vigil in London's Trafalgar Square on Thursday, March 23, following the attack on Parliament.

    London unites against terror in defiant vigil

    Story by Eliza Mackintosh; photos by Sarah Tilotta, CNN
    A day after Londoners were confronted with a cruel and ruthless attack, crowds gathered in the heart of the city to pay tribute to the victims.