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 man places a Boston Red Sox that at the make shift memorial that he has helped keep organized in response to Monday's Boston Marathon bombing on Boylston Street in Boston, Massachusetts on April 17, 2013. On Monday two bombs detonated near the finish line of the Boston Marathon killing 3 and injuring over 140. UPI/Matthew Healey
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