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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A Boston Police cruiser drives past an Army National Guard checkpoint on Boylston Street in Boston, Massachusetts on April 16, 2013. The street and surrounding streets are blocked off as federal and state authorities investigate two bombs that detonated near the finish line of the Boston Marathon Monday afternoon killing 3 and injuring 150. UPI/Matthew Healey
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