(NEWSER– Russian officials have finally revealed what fueled mounting concerns about Tamerlan Tsarnaev: After they wiretapped his phone, they caught him talking about jihad with his mother in 2011. In another recorded conversation, mother Zubeidat Tsarnaeva spoke to a person in southern Russia who is the subject of a separate FBI inquiry, the AP reports. But Russian officials didn't tell the FBI about the conversations until after the Boston Marathon bombings.

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