The Soviet Union was suppressing the Islamic Republics in its' borders since the 1950's.  In some instances, the casualty totals were in the thousands...

Since 2000, there has been questions about the mysterious nature of various criminal/terrorist acts in Russia, and whether they have been used to divert attention from other issues, as well as who is really behind them....

Frankly, I would not trust anything in terms of "news" that comes out of this particular tragedy...