Updated: April 18, 2013 at 10:11 AM
Boston Marathon bombing (59 images)
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.
A runner tears up while viewing the site of 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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A man hangs a Chinese flag at a makeshift memorial for Monday's Boston Marathon bombing victims near the site 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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A man arranges flowers at a makeshift memorial for Monday's Boston Marathon bombing victims near the site 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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Signs and flowers adorn a makeshift memorial for Monday's Boston Marathon bombing victims near the site 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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