This Monday, April 15, 2013 photo shows a man who was dubbed Suspect No. 2 in the Boston Marathon bombings by law enforcement, on the left side of the frame, wearing a white baseball cap, walking away from the scene of the explosions. The FBI identified him as 19-year-old college student Dzhokhar Tsarnaev, who along with his brother Tamerlan, 26, previously known as Suspect No. 1, killed an MIT police officer, severely wounded another lawman and hurled explosives at police in a car chase and gun battle during a night of violence, early Friday, April 19, 2013. Tamerlan Tsarnaev was killed overnight, officials said, while his brother Dzhokhar remains at large. (AP Photo/David Green)
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