Who's Behind the Bombings in Russia?

No group has claimed responsibility but signs point to Islamist separatists from the North Caucasus.
3:00 | 12/30/13

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Transcript for Who's Behind the Bombings in Russia?
For more on the investigation and of course the international attention that this has been getting a lot of rain ABC's Alex Mark Clark who is in London Alex. Has anyone claimed responsibility for these attacks. Good afternoon again no one's claimed responsibility yet the Russians haven't said. Who they suspect they have human. Given out -- sexes. Of the attackers from yesterday and today at first it was initially reported that a female suicide bomber carried out yesterday's attack. At the -- regret train station which killed seventeen people. All signs would point to Islamist separatists from the north caucuses which is that restive region in southern Russia where. Almost on a daily weekly monthly basis we do see regular attacks suicide bombings other types of bombings against. A government infrastructure but rarely do they go beyond -- the confines. Of those southern provinces and that's what's so surprising is that now not only have we seen one but two attacks in Volgograd one of Russia's. Biggest cities so even though they haven't released the names of of of any sort of suspects who carried -- the attacks or the group that they. Suspect of being behind it you can certainly be sure that they are. Investigating closely and looking specifically act. The organization of a man named -- Kumar -- who. Karen no reference in her piece there he runs a large umbrella group called the Caucasus emirate. Which essentially is an an Islamist insurgency. Whose goal is to get those provinces in the south in the northern caucuses to break away from. From Russia and and the focus of a lot of previous attacks have been obviously on government interest but now this clearly being a transportation -- Effort. Russia's president -- signed a new more stringent anti terror along with that with a focus on separatism so what are the penalties now going forward. Well this is this is something that you know Russia is keenly aware president's Putin is keenly aware of the fact. That these attacks and and previous -- fears. Are going to create bigger concerns in the lead up. To the Olympics so what his goal was -- these new anti terrorism laws was to assuage some of those fears make the penalties. Even harsher so what essentially has been done is that is -- he approved this law that would penalize family members that would. The force family members of of terrorists that are alleged terrorists to a pay compensation. To victims there would pay compensation. For property as well as confiscating. A property of those accused terrorists so that is their fear now that there will be an even stronger more violent backlash because of that. Well absolutely and that that's what the response would be is that -- in light of the crackdown by the Kremlin -- by President Putin and his security forces that that will only. Further anger. The local population in Chechnya Dagestan Ingushetia those provinces. In the southern part of Russia on the north Caucasus. So there certainly could be some with some backlash that it. Did you know that the -- the instigation the the use of these anti terrorism laws -- fuel that anger and and insights. Terrorists to come out in an attack targets well beyond the confines of those provinces in to places like boulder -- into places like Moscow and of course. The big juicy target if you will is the Sochi games. And that's -- want to -- talk little bit about that specifically because that that the focus of these kind of attacks is certainly shifted a great deal -- brought Sochi further south there. Obviously is surrounded by -- former Soviet nations home to a lot of those separatist groups so. The Olympics now really is is is that the core focus and as they've been looking at those trolleys at these transportation hubs is that. The is that the -- the intention. Well absolutely because if you look add to the tax we've seen in Volgograd one against the train station one against the trolley -- are very soft targets. All of though the people who have been killed have been civilians. As I mentioned -- you know this is a rare attack that has taken place. Beyond the north caucuses this is the third. And in three months two and a row over the past two days and -- and then one or October so what. These groups these these insurgents are showing is that they can go well beyond that they can go into a place like -- -- which isn't necessarily used to these kinds of attacks. In 2011 we saw an attack against a Moscow airport in 2010 when I was living in Moscow. I covered a double suicide bombing in the metro in mosque in one of the Moscow's main station so. That's what they're showing is we can go beyond the north caucuses we can attack. A bid bid -- games in Sochi which of course you know. Generally when these attacks happen it is in the north caucuses it doesn't get much attention because it's very localized and it's a place where this stuff happens all the time. But now you're talking about. Increasing fears that a deadly strike could take place when the entire world is watching -- just a few weeks were in Russia and the Olympic -- planning committee have been very at a -- fact security is our number one focus on this. I think take any additional measures given the past 24 hours -- they asked actually for for international help. Well I'm just speculating here but I can imagine there's a lot of frustration the Kremlin right now that everybody's talking about the link. With the Olympics because this is this is. President Putin's pet projects he has taken every precaution necessary to make sure. That nothing happens during the Olympic Games so they have raised security. Regionally around Volgograd two what they called the yellow level which is the second highest level as Karen Travers mentioned in her piece they have. Imposed a new security measures around the country particularly airports and railway stations. But the head of the Russian Olympic Committee came out and said that nothing has changed for the Olympics they've said from the get go President Putin has set himself. That these will be the safest Olympic Games in history and so that these attacks in Volgograd over the past two days won't change anything for the --

This transcript has been automatically generated and may not be 100% accurate.

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