Boston Gripped by High-Stakes Manhunt

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The Boston area remained on lockdown into the afternoon Friday as authorities conducted a manhunt for one of two brothers of Chechen background suspected in Monday's Boston Marathon bombings and a deadly showdown that began unfolding Thursday night.

Authorities identified one suspect as 26-year-old Tamerlan Tsarnaev, who was killed in a confrontation with police in Watertown, Mass., according to a U.S. law-enforcement official.

A manhunt was on for the second suspect, identified as Dzhokhar Tsarnaev, 19 years old. Both brothers were believed to be involved in the fatal shooting of a Massachusetts Institute of Technology campus police officer during Thursday night's chaotic series of events.