A jihadi organization calling itself the "Subversive Group of Ansar al-Sunnah" claimed credit for the suicide bombings in Volgograd, Russia, in December 2013, and threatened more attacks unless Russia withdraws its forces from the Caucasus.

The Russian communiqué was posted on a website affiliated with the Islamic Emirate of the Caucasus (IEC), on January 18, 2014. The group's leader, "Umar," addressed the Russian people, notifying them that IEC chief Doku Umarov ordered the resumption of jihadi attacks in Russia, and warning that more operations are pending. He argued that Russian President Vladimir Putin and his colleagues do not care about the interests of the people, and that if Russian forces remain in the Caucasus, the people will suffer the consequences.

Umar declared: "A couple successful operations were immediately carried out on militant territories, and this is just the beginning of your end. Each region, each city, street, neighborhood - we will fill your homes with blood!... You started this war back in Chechnya during the 90's and then Putin promised you victory, but what has he done? By the grace of Allah, this war became the cause for the spread of jihad throughout the Caucasus. And now we will spread it over the entire Russian territory!"

The group later released a video showing the purported bombers, Suleiman and Abdul Rahman, giving speeches and preparing the explosives and detonators. The video also featured news footage and pictures of the blast at the train station on December 29, 2013, and the trolleybus on December 30.