(NBC NEWS) -- One of the Boston Marathon bombing suspects landed in at least one low-level intelligence database two years ago, and the system alerted U.S. agents when he flew to Russia last year, federal officials told NBC News on Wednesday.

But federal authorities took no action against Tamerlan Tsarnaev because the FBI had already interviewed him at the request of the Russian government and found no sign of terrorist activity, the officials said.

The officials said Russia asked for information about Tsarnaev twice in 2011, once early in the year from the FBI and once in September from the CIA, because the Russians said they had reason to believe he was becoming a radical.
When the FBI turned up nothing after the first request, it asked Russia for further information, but Russia never supplied it, the officials said. The FBI asked again after the September request to the CIA, and Russia again failed to respond, they said.

The FBI in early 2011 opened a threat assessment, its lowest-level investigative step, which automatically put an entry in a low-level intelligence database, the Treasury Enforcement Communications System, the officials told NBC News.

In addition, Rep. Michael McCaul, R-Texas and the head of the House Homeland Security Committee, said Wednesday that
Tsarnaev turned up in a database maintained by the National Counterterrorism Center.

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