TIME

What Russia Knew About the Boston Marathon Bomber

An unreleased report shows that the Russian government concealed key information on Tamerlan Tsarnaev two years before the bombing

Could Russia’s information on Tamerlan Tsarnaev have prevented the Boston Marathon bombings?

Russian authorities intercepted a phone conversation in which the older Tsarnaev brother discussed Islamic jihad with his mother, but they withheld the information from the FBI, according to an unreleased government review that comes as the one-year anniversary of the Boston bombing approaches.

Congress will be briefed on additional details from the report Thursday, and some findings are expected to be released to the public next week.

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