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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U.S. President Barack Obama makes a statement on the progress of the investigation of the tragedy in Boston in the White House Press Briefing room on April 16, 2013. Although the bombings have been called a terrorist act, investigators say it was too early to say the attacks were carried out by a foreign or domestic group. UPI/Dennis Brack/Pool
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