Bomb Suspect Calm as Blast Ripped Apart Boston Marathon

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Dzhokhar Tsarnaev has communicated to investigators that he and his older brother alone were responsible for the Boston Marathon bombings and motivated by extremist Islam, according to a U.S. official briefed on the initial interrogation.

By nodding his head and occasionally by writing -- a gunshot wound to his neck prevents him from speaking -- Tsarnaev, 19, indicated that he and his brother, Tamerlan, 26, who was killed in a police shootout, weren’t aligned with any known terrorist or military groups, the official said.