CNN's Nick Paton Walsh reports on Tamerlan Tsarnaev's six-month visit to Russia in 2011 and who he might have met there. His trip may provide clues to a major question pertaining to the Boston Marathon attack: did the brothers have an accomplice?
CNN's Nick Paton Walsh reports on Tamerlan Tsarnaev's six-month visit to Russia in 2011 and who he might have met there. His trip may provide clues to a major question pertaining to the Boston Marathon attack: did the brothers have an accomplice?