Report: Russia withheld information on Tamerlan Tsarnaev

The Russian government declined several requests from the FBI for additional information on Boston Marathon bombing suspect Tamerlan Tsarnaev after an initial investigation in 2011, according to The New York Times. The information comes from an inspector general’s review of the attack.

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 F.B.I. agents in Boston, the Russians declined several bureau requests for additional information they had about Mr. Tsarnaev. At the time, American law enforcement officials believed that Mr. Tsarnaev posed a far greater threat to Russia.

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Russia didn’t share the information with the FBI until after the bombing, according to the report. The report was produced by the Office of Intelligence Community and the Department of Homeland Security. Although it has not yet been made public, multiple US officials anonymously described its content to The New York Times. Some of the report’s findings are expected to be released next week.