MIT Police Officer and One Boston Marathon Suspect Dead

One of two suspects in the shooting of a Massachusetts Institute of Technology police officer has died and a massive manhunt is underway for another, who is believed to be tied to the Boston Marathon bombing.

Boston Police Commissioner Ed Davis said early Friday on Twitter that one of the two suspects in that officer's shooting was killed. He said the at-large suspect, labeled by the FBI as "suspect two" in the marathon bombing, was "armed and dangerous."

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