U.S. officials are saying Tamerlan Tsarnaev’s name was added to a U.S. government terrorism database about 18 months before the Boston Marathon bombings.
In the fall of 2011, Russia contacted the CIA with concerns about Tamerlan Tsarnaev. Two officials say the CIA added Tsnaraev's name to a terrorism database and that the FBI conducted an investigation but did not find he had any terror connections.
On Wednesday, U.S. officials also said that the pressure-cooker bombs the Tsarnaev brothers used were triggered by a remote detonator of the kind used in remote-control toys.
More is emerging about the criminal case against the surviving suspect in the Boston Marathon bombings.
U.S. officials say Dzhokhar Tsarnaev and his brother appear to have been motivated by their religious views, not any connection to any Muslim terrorist groups. The officials made the assessment after Tsarnaev was interrogated in his hospital room, where he's being treated for severe wounds allegedly suffered during violent encounters with law enforcement following the Boston Marathon bombings.