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The significance of the trip was magnified late Friday when the F.B.I. disclosed in a statement that in 2011 “a foreign government” — now acknowledged by officials to be Russia — asked for information about Tamerlan. The request was “based on information that he was a follower of radical Islam and a strong believer, and that he had changed drastically since 2010 as he prepared to leave the United States for travel to the country’s region to join unspecified underground groups.”
The senior law enforcement official said the Russians feared he could be a risk, and “they had something on him and were concerned about him, and him traveling to their region.” Chechen extremists pose a greater threat to Russia than they do to the United States, counterterrorism specialists say, though some of the groups have had ties to Al Qaeda.
But the F.B.I. never followed up on Tamerlan once he returned, a senior law enforcement official acknowledged on Saturday, adding that its investigation did not turn up anything and it did not have the legal authority to keep tabs on him.
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