1 Marathon Bombing Suspect Killed, Manhunt For Second

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Two men suspected in the Boston Marathon bombing that killed three people this week terrorized the area overnight. One is dead, but the other is on the loose, police say, and he's armed and dangerous. Police pursued two men early Friday who shot a police officer to death, stole a vehicle and threw explosives at law officers pursuing them. Authorities believe they are the same two men sought in the marathon attacks.