Scenes from Boston bombing manhunt

STFFBI and local law enforcement personnel continue their search for a suspect in the Boston Marathon bombings on Norfolk Street in Cambridge, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist.(AP Photo/Michael Dwyer)
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