The Russian government declined to provide the F.B.I. with information about Boston Marathon bombing suspect Tamerlan Tsarnaev two years before the attack that might have prompted more extensive scrutiny of him, the New York Times reported Wednesday.
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The information is contained in an inspector general’s review of how American intelligence and law enforcement agencies could have thwarted the bombing.
Russian officials had told the F.B.I. in 2011 that Tamerlan Tsarnaev, “was a follower of radical Islam and a strong believer,” the New York Times reported, and that Tsarnaev had changed drastically since 2010 as he prepared to leave the United States for travel to Russia.
But after an initial investigation by F.B.I. agents in Boston, the Russians declined several bureau requests for additional information they had about him, the newspaper reported.
The 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 Tsarnaev and his mother in which they discussed Islamic jihad.