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17 of 52: A police officers rides on the back of a van at a staging area as a manhunt is conducted for a suspect Friday, April 19, 2013, in Watertown, Mass. One of two suspects in the Boston Marathon bombing is dead and a massive manhunt is underway for another, authorities said early Friday April 19, 2013. Residents of Watertown, a Boston suburb, have been advised to keep their doors locked and not let anyone in. (AP Photo/Matt Rourke) ( Photo)

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