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A person holds a phone with a sign on the screen reading 'I am Charlie' in French during a vigil of people, including many who were French, to show solidarity with those killed in an attack at the Paris offices of weekly newspaper Charlie Hebdo, in Trafalgar Square, London, Wednesday, Jan. 7, 2015. Masked gunmen stormed the Paris offices of a weekly newspaper that caricatured the Prophet Muhammad, methodically killing 12 people Wednesday, including the editor, before escaping in a car. It was France's deadliest postwar terrorist attack. (AP Photo/Matt Dunham)