(Reuters) The FBI in 2011 interviewed one of the brothers suspected in the deadly Boston Marathon bombings, a U.S. law enforcement source said on Friday, a disclosure that could raise questions about whether the government missed potential warning signs about the men’s behavior.

The source said the FBI’s dealings two years ago with Tamerlan Tsarnaev occurred following a request from an unidentified foreign government.

The FBI did not produce any “derogatory” information on Tsarnaev and agents then put the matter “to bed,” said the source, who spoke on condition of anonymity.

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