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Police officers and rescue workers arrive at the scene of an attack on July 14, 2016, after a van ploughed into a crowd leaving a fireworks display in the French Riviera town of Nice. The mayor of the French city of Nice said dozens of people were likely killed after a van rammed into a crowd marking Bastille Day in the French Riviera resort today and urged residents to stay indoors. / AFP PHOTO / VALERY HACHE