The CIA had Tamerlan Tsarnaev's name put into a terror watchlist after being contacted by Russian authorities in 2011, sources told Fox News -- raising more questions about why the Boston bomber's trip to Russia the following year didn't raise more red flags.
Sources say the Russians contacted the FBI once in March 2011, and several months later they contacted the CIA about Tsarnaev.
In October 2011, the CIA sent information to many federal agencies and to "the watchlisting system" about him, the sources say. That step ultimately put him on the vast TIDE database of people potentially tied to terrorism cases.
The FBI has said previously that it was told Tsarnaev was a "follower of radical Islam" and was preparing to travel to a foreign country to join unspecified underground groups. The FBI said that it responded by interviewing Tsarnaev and family members, but found no terrorism activity.
In early 2012, Tsarnaev would travel to Russia for six months. The nature of that trip is still unclear.
Two top Republican senators are now calling for a Senate Homeland Security Committee hearing on the Boston Marathon bombings, as lawmakers question whether enough was done to prevent the attack.
Sens. John McCain, R-Ariz., and Kelly Ayotte, R-NH, requested the hearing Wednesday, saying "it has become increasingly apparent that more questions need to be answered regarding the failure to prevent this tragedy."
The senators cited the reporting by Fox News and others that Russian officials contacted the U.S. government at least twice in 2011 with concerns about Tsarnaev, the Chechen who two years later would carry out last week's deadly bombing of the Boston Marathon, as an example of an instance that merits further investigation.
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