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 wheels her luggage past an Army National Guard security checkpoint on Belvidere 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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Members of the Army National Guard stand inside the Hynes Convention Center MBTA station in Boston, Massachusetts on April 16, 2013. Security in Boston is high after two bombs detonated near the finish line of the Boston Marathon Monday afternoon killing 3 and injuring 150. UPI/Matthew Healey
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Members of the Army National Guard stand inside the Hynes Convention Center MBTA station in Boston, Massachusetts on April 16, 2013. Security in Boston is high after two bombs detonated near the finish line of the Boston Marathon Monday afternoon killing 3 and injuring 150. UPI/Matthew Healey
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A woman in a Boston Marathon jacket walks past members of the Army National Guard inside the Hynes Convention Center MBTA station in Boston, Massachusetts on April 16, 2013. Security in Boston is high after two bombs detonated near the finish line of the Boston Marathon Monday afternoon killing 3 and injuring 150. UPI/Matthew Healey
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