 The group's base of operations was Nalchik and the Balkarian enclave around Mount Elbrus.Yarmuk was the main force involved in the botched raid by around 100–200 mostly untrained militants on the capital Nalchik in 2005, during which more than 140 people, including 95 alleged insurgents, were killed.Scores of suspects were detained after the attack, and at least 52 were put on trial.