Thomas Deweil News Today

>> theres a whole generation of chechens who grew up with their families being displaced, relatives being killed, and so on. >> reporter: thomas deweil has studied and written about the region. >> for most people thats just a traumatic experience, but obviously for a small minority this is something that is in their dna, that drives them. >> reporter: and like many displaced chechens tamerlan may have struggled to fit in. chechnya is still home to militant separatist groups. and the home tamerla...

>> reporter: luis vasquez was friends with tamerlan in high school. >> thats where hes from. thats where he told me he has struggles. he didnt really elaborate. >> theres a whole generation of chechens who grew up with their families being displaced, relatives being killed, and so on. >> reporter: thomas deweil has studied and written about the region. >> for most people thats just a traumatic experience, but obviously for a small minority this is something that is in their dna, that drives them...