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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Boston Marathon bombing suspect Dzhokhar Tsarnaev.

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Manhunt underway for second Boston bombiing suspect Dzhokhar Tsarnaev.

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Police with guns drawn search for a suspect on April 19, 2013 in Watertown, Massachusetts.

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A suspect wanted for questioning in relation to the April 15 Boston Marathon bombing is seen in handout photo released through the Boston Police Department Twitter page, April 19, 2013.