FBI Director Mueller defends the agency in Boston bombing
Mueller told a Senate subcommittee that an FBI investigation of Tamerlan Tsarnaev initiated in March 2011 after a tip from Russian authorities found that Tsarnaev posed no terrorist threat. He said two later attempts to obtain more information from the Russians got no response, and the case was closed.
Tsarnaev, 26, was killed in a shootout with police four days after the April 15 bombing. His brother, Dzhokhar, 19, is recovering from gunshot wounds in a federal prison hospital and faces charges that could carry the death penalty in connection with the bombing, which killed three people and injured more than 260 others. The brothers also are suspected of killing a campus police officer at Massachusetts Institute of Technology.