In a statement posted on the Kavkaz-Tsentr Chechen separatist center, an organization calling itself the Caucasus Front claimed responsibility for the attacks.
Chechnya's separatist deputy prime minister, Akhmad Zakaev, told RFE/RL's North Caucasus Service that the Caucasus Front answers to the separatist president.
"The Caucasus Front was established by Abdul-Khalim Sadullayev after the death [of his predecessor] Aslan Maskhadov [in March]," Zakaev said. "It is a unit of the armed forces of the Chechen Republic of Ichkeria. As far as I know, it was this unit that conducted this planned military operation in Nalchik."