Posted at: 04/25/2013 7:12 AM
BOSTON (AP) - U.S. officials are expected to brief the Senate today on the investigation into the Boston Marathon bombing attack.
Investigators say before suspect Dzhokhar Tsarnaev was read his constitutional rights, he told them his older brother Tamerlan had only recently recruited him to take part in the bombings.
Tamerlan was killed in a shootout with police.
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