Police in the Russian region of Dagestan said 11 gunmen were killed in a predawn firefight with law enforcement and security agents on Wednesday.
Dagestan's Interior Ministry said one security officer was also killed and another seriously wounded.
The fight erupted when police and Federal Security Service agents stopped a minibus near the village of Tsmur in southern Dagestan around 1 a.m. Wednesday. Police said they found weapons, explosives, ammunition and religious literature in the vehicle.
Dagestan has long been troubled by violence spilling over from neighboring Chechnya, as well as a police crackdown on Islamic militants and criminal gangs.