walsh in the dagestan region of russia. there has been a big crackdown on alleged muslim extremists in russia today by russian authorities. did this have any connection, as far as we know, to this ongoing investigation? >> they've not said that it does and there is no reason to believe there is cak, but large numbers arrested in an area outside of moscow, not one we've seen in the spotlight in the past in terms of statements from russian security services, but this large number surely will make people think of two possible reasons for this. perhaps they had been looking to go for this organization for some period of time and want the international political cover of what just happened in boston and the suggestion of a connection here, or maybe this is an attempt to try to preempt criticism they're not doing enough to stamp down on hardcore islamic groups here. as i say, no real specifics as to why they made these arrests but my long time working in russia, i really haven't seen such large numbers in one single swoop, anderson. >> that's a large roundup