We know that the FSB (formerly KGB) sets off bombs in Russia to blow up their own citizens:
http://old.nationalreview.com/comment/comment-satter043002.asp
This particular episode looks like the Chechens did it.
It was FSB engineered bombing at Moscow apartments which propelled Putin to power.
We know that the FSB (formerly KGB) sets off bombs in Russia to blow up their own citizens:
Ummmm... What?! They've got the equivalent of our "9/11 Truthers" like we do here? LOL ...