WATERTOWN, Mass. (AP) - Thousands of police officers are on the streets in the Boston area, looking for the remaining suspect in the Boston Marathon bombings. Overnight, authorities say, the two suspects killed a police officer at MIT and then hurled explosives at officers during a car chase and a gun battle that left one of the suspects dead and his brother on the loose. They are being identified by law enforcement officials and family members as two brothers from a Russian region near Chechnya -- a region that has been plagued by an Islamic insurgency that has carried out deadly bombings.
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