Runners Return from Boston to Birmingham/CBS 42

Local runners return from Boston changed

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Image from a FBI and Depart of Homeland Security joint bulletin issued to law enforcement and obtained by AP shows the remains of a black backpack that the FBI says contained one of the bombs that exploded during the Boston Marathon. (AP Photo/FBI)

Bomb fragment pictured in FBI report

The FBI says it has evidence that indicates one of the bombs that exploded in the Boston Marathon was contained in a pressure cooker with na…