. >> well, let's speak to fred weir a journalist with the christian science monitor, joining us from moscow, via skype. little doubt that the people behind the bombers are the islamist fighters in the north caucasus region. explain why volgograd is being targeted. not only the attacks today and yesterday, but in october, on a bus. >> yes, this is the third attack in volgograd. it certainly demonstrated or demonstrates a concerted ability by this terrorist organization to hit repeatedly in a single place. it should be a well-protected city, as these things go. it's clear that volgograd has been chosen for some reason. whether or not it's because the main targets, which are obviously sochi and moscow are invulnerable due to the security precautions or whether - sorry. whether they are launching a diversion. this is the problem. nobody knows. >> i get the fear is this could be the start of a sustained campaign. as you say, leading up to the fact that the winter olympics are held in sochi in a few weeks time. that will be the foremost concern for vladimir putin. >> yes, and he has staked

right now, we are joined by fred weir via skype, the moscow correspondent for the "christian science monitor." do you have any idea who might have been responsible for this attack? >> reporter: i think that it's 99% susta 99% certain that we are looking at the same insurgents who attacked in bolegrad barrel two months ago, dokumarav's network from the north caucuses or some other group. but it certainly originates there in russia's really eithering insurgenseething insu >> fred, as he indicated, he was going to step up attacks saying he was end his moratorium. i want to read to you, the warning, there is a heighten risk against softer target did such as transport infrastructure in sochi and the surrounding area. this was written in october. so, if i am an american citizens thinking about traveling to sochi for the winter games, how secure, how safe should i feel? >> i think everybody is going to be worried because there are two schools of thought. >> fred, we are having problems. >> striking. >> okay. ? >> places like bolegregrad because they are outlying regions. as we know, russian