Radical Ization To News Today

Assure there was no ongoing public danger. >>heather: what other ways could the investigation still be hampered? >>reporter: authorities are zeroing in on tamerlan tsarnaevs trip to russia. did he have help and training when he was there? they say the russians are not being completely cooperative. >> the big unknown is still the six months, over six months, in russia. clearly, that is where they went from the process of radical ization to -- the older brother -- to violence. there is a lot we do...