Investigators are looking into whether Tsarnaev was influenced toward radicalization during a six-month visit to Dagestan in 2012 -- a region known to include radical jihadists who have battled the Russian government.
Russian special forces killed two members of a jihadist group in an early morning raid this weekend in the semiautonomous republic, two Russian police sources told CNN on Monday.
Authorities have not said whether the raid was linked to the Boston bombing.
But
one of those killed was an associate of Abu Dujan, the slain leader of a militant Islamist organization that produced at least one video that Tamerlan apparently posted and later removed from a social media account, according to an analysis by CNN and the SITE Intelligence Group.
http://edition.cnn.com/2013/04/29/us/boston-attack/index.html?eref=edition