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April 21, 2014

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Tactical police assemble outside a building at Harvard University in Cambridge, Mass., Monday, Dec. 16, 2013. Four buildings on campus were evacuated after campus police received an unconfirmed report that explosives may have been placed inside, interrupting final exams.

Josh Reynolds / AP

Tactical police assemble outside a building at Harvard University in Cambridge, Mass., Monday, Dec. 16, 2013. Four buildings on campus were evacuated after campus police received an unconfirmed report that explosives may have been placed inside, interrupting final exams.