The FBI is investigating a trip that Tamerlan Tsarnaev, the 26-year-old suspected Boston bomber who was killed in the first shootout with police, took to Chechnya and Dagestan last year. He reportedly went to the mainly Muslim regions in the north Caucasus area of Russia. Tamerlan spent six months in Dagestan, his father said he was just renewing his passport. It's still publicly unknown what the motive of the brothers was. This is of utmost importance since the FBI announced on Friday that the Russia government was seeking information on Tamerlan because he was a follower of radical Islam.