Our beloved law-enforcement doesn't give any reasonable comments. Accident is what suits them best.
Chechenpress already commented something like "Terrorism is not a Chechen way" and "everyone knows it". The same site that boasted that their "freedom fighters" blew up Kursk...
Anyway we have al kids of security measures strengthened in airports (as if there can be anything more done), Militia checking papers of people from Caucasus etc. I have heard at least three loonies from parliament claiming to "strengthen national security measures". Guess what will follow? Even now you'd better not forget your passport when going out to get a pack of cigarettes...
Another crazy thing was a suggestion that both airliners were hijacked to hit nuclear power stations, and shot down to prevent it. I don't believe it.