Police in the northeastern U.S. state of Massachusetts are conducting a massive manhunt for one of the suspects in Monday's Boston Marathon bombings, after killing the other one in a shootout late Thursday.
1 Boston Bombing Suspect Dead, Police Search for Suspected Accomplice

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Map of Boston and surrounding areas.

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A man looks out of his door as a SWAT team member knocks on his neighbors door as they search for the remaining suspect in the Boston Marathon bombings in Watertown, Massachusetts April 19, 2013.

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Police in tactical gear surround an apartment building while looking for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013.

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A woman looks out a window at her home as police start to search an apartment building while looking for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013.