Less than five days after the bombing at the Boston Marathon, the key suspects were identified and apprehended - with one dead, the other in custody. How did investigators transform the chaos of the bombing into a coherent trail of clues, pointing to the accused killers? NOVA follows the manhunt step by step, examining the role modern technology - combined with old-fashioned detective work - played in cracking the case. Top criminal investigators and anti-terrorism experts tell how the world of crime fighting could be transformed tomorrow.
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