Russia Didn’t Share All Details on Boston Bombing Suspect, Report Says -- By Michael Schmidt and Eric Schmitt, The New York Times

The Russian government declined to provide the F.B.I. with information about one of the Boston Marathon bombing suspects that would most likely have led to more extensive scrutiny of him at least two years before the attack, according to an inspector general’s report.

Russian officials had told the F.B.I. in 2011 that the suspect, Tamerlan Tsarnaev, “was a follower of radical Islam and a strong believer” and that Mr. Tsarnaev “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.”

But after an initial investigation by the F.B.I., the Russians declined several requests for additional information about Mr. Tsarnaev, according to the report, a review of how intelligence and law enforcement agencies could have thwarted the bombing.

At the time, American law enforcement officials believed that Mr. Tsarnaev posed a far greater threat to Russia.

The new inspector general’s report found that it was only after the bombing occurred last April that the Russians shared with the F.B.I. the additional intelligence, including information from a telephone conversation the Russian authorities had intercepted between Mr. Tsarnaev and his mother in which they discussed Islamic jihad.

 “They found that the Russians did not provide all the information that they had on him back then, and based on everything that was available the F.B.I. did all that it could,” said a senior American official briefed on the review.

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