Counterterrorism Blog:

Chechen Mujahideen Claim Sabotage Bombing of Russian Natural Gas Storage Facility
By Evan Kohlmann

The NEFA Foundation has obtained a communiqué issued by a group calling itself “Muwahiidun ar-Rusi” ("The Russian Monotheists") claiming responsibility for the bombing of "the largest subterranean natural gas storage facility in the world" in Stavropol, Russia. The communiqué was posted by Kavkaz Center, the official mouthpiece of the Chechen insurgents. Kavkaz stated that it "does not have reliable evidence about the organization...Let us remind that the same organization announced its participation in the sabotage at the Sayano-Shushenskaya hydroelectric plant."
The complete text of the communique can be accessed via the NEFA Foundation website.