Apr. 21 - The U.S. Federal Bureau of Investigation searches for a motive in the Boston bombing. Rough Cut (no reporter narration)
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The surviving suspect in the Boston Marathon bombings lay seriously wounded and unable to speak in a hospital on Saturday as investigators worked to determine a motive and whether the two ethnic Chechen brothers accused of the attack acted alone.
Dzhokhar Tsarnaev, 19, was captured late on Friday after a gunfight with police that ended a day-long manhunt and sent waves of relief and jubilation throughout Boston. His brother,Tamerlan, 26, died on early Friday after a shootout with police.
Investigators of the FBI recovery team are trying to establish whether the pair had assistance leading up to the detonation of bombs made in pressure cookers and packed with ball bearings and nails at the crowded finish line of Monday's marathon, killing three people and injuring 176.
Tamerlan, 26, travelled to Moscow in January 2012 and spent six months in the region, a law enforcement source said, but it was unclear what he did while he was there and if he could have had contact with militant Islamist groups in southern Russia's restive Caucasus region.
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