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Are not involved in the investigation but from the outside with experience, that's what they're saying. >> nick, you've been now in dagestan in russia for awhile, tracking down this story. it's possible we may never know the specifics of what that elder brother was doing over there six months or who he met with, when he was back in russia last year, correct? >> reporter: absolutely. there are still people trying to piece it together. my conversations with russian security services, they give no comment at all but there's a suggestion perhaps there is more information ticking around on their si...

What they're saying. >> nick, you've been now in dagestan in russia for awhile, tracking down this story. it's possible we may never know the specifics of what that elder brother was doing over there six months or who he met with, when he was back in russia last year, correct? >> reporter: absolutely. there are still people trying to piece it together. my conversations with russian security services, they give no comment at all but there's a suggestion perhaps there is more information ticking around on their side of the fence. we do know this extremist militant was attending the same mosque h...

Suggestion perhaps there is more information ticking around on their side of the fence. we do know this extremist militant was attending the same mosque here, an islamist accused of extremism by authorities. we know they attended the same mosque because his mother told me so. the question here is whether the men actually ever met at all or whether there was some other kind of link, perhaps tamerlan tsarnaev had to militancy here. he was here for six months. we don't know what he did for the first few of them. we know his aunt first saw him in march this year when he came here in january and hi...