The Grand mosque in Makhachkala, Dagestan. Tamerlan Tsarnaev visited this city in southern Russia for six months in 2011. (Photo: Wiki Commons)
Russian counter-terrorism officials tipped off the FBI at least once about Tamerlan Tsarnaev, the dead alleged Boston bomber. He was questioned but released. Anchor Marco Werman speaks with Fiona Hill, an expert on Russia and the Causcasus at the Brookings Institution to find out what went wrong.
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