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?
Anderson Cooper goes beyond the headlines to tell stories from many points of view, so you can make up your own mind about the news. Tune in weeknights at 8 and 10 ET on CNN.
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