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.
Updated: April 18, 2013 at 10:11 AM
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Billie Starks of Cambridge, Massachusetts covers her face after tearing up while viewing the site of Monday's Boston Marathon bombing on Boylston Street in Boston, Massachusetts on April 17, 2013. This year's marathon was Starks first but she was unable to finish because of the bombing. 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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