Two explosions near the finish line of the Boston Marathon killed three people and injured more than 150 on April 15, 2013. Security tightened in cities across the country as the investigation began.
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Pedestrians walk past a Metropolitan Tactical Police officer standing guard on the corner of Massachusetts and Commonwealth Ave on Monday April 15, 2013, after an explosion at the finish line of the Boston Marathon killed at least three people and injuring more than 100. UPI/Jacob Belcher
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