Boston Marathon bombing

Associated Press
This image from a Federal Bureau of Investigation and Department of Homeland Security joint bulletin issued to law enforcement and obtained by The Associated Press, shows the remains of a pressure cooker that the FBI says was part of one of the bombs that exploded during the Boston Marathon. The FBI says it has evidence that indicates one of the bombs was contained in a pressure cooker with nails and ball bearings, and it was hidden in a backpack. (AP Photo/FBI)

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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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