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April 30th, 2013
10:37 AM ET

Importance of not jumping to conclusions in Boston bombing investigation – Fmr. MI6 director weighs in

Richard Barrett, fmr. dir of MI6 counter terrorist operations and senior director of the The Soufan Group, weighs in on the investigation into the Boston marathon bombing. He explains the potential reasons why female DNA was found on the explosives, how Tamerlan Tsarnaev's widow could fold into the investigation and the importance of working leads in Russia.

Filed under: Boston Marathon bombings • Extremism