Boston Marathon bombing

Associated Press
In this Monday, April 15, 2013 photo, Boston Firefighter James Plourde carries an injured girl away from the scene after a bombing near the finish line of the Boston Marathon in Boston. The FBI's investigation into the bombings at the Boston Marathon was in full swing Tuesday, with authorities serving a warrant on a suburban Boston home and appealing for any private video, audio and still images of the blasts that killed at least three and wounded more than 170. (AP Photo/MetroWest Daily News, Ken McGagh) MANDATORY CREDIT

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Two pressure cooker bombs exploded near the finish line of the April 15, 2013 race in an area packed with fans cheering the passing runners. Three people were killed and more than 260 injured, including at least 16 who lost limbs.

The throngs of spectators lining the streets at a storied big-city marathon were once a wholesome scene of civic pride and friendly support. April's attack came as a haunting reminder that the crowds at a high-profile event are also a vulnerable target.

Authorities say brothers Dzhokhar and Tamerlan Tsarnaev, ethnic Chechens from Russia who emigrated to the United States as children, planned and carried out the bombings in retaliation for U.S. involvement in Muslim countries.

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