Boston Marathon bombing

Associated Press
People react as an explosion goes off near the finish line of the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two explosions went off at the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. (AP Photo/The Boston Globe, David L Ryan) 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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