The republic saw a flare-up of violence in late 2010 and early 2011, in the wake of the death of Anzor Astemirov, a senior figure in the Caucasus Emirate and the head of its United Vilayat of Kabarda, Balkaria and Karachay. The new leaders of Kabardino-Balkaria's guerrilla movement, Asker Dzhappuyev and Ratmir Shameyev, preferred a more aggressive approach and the militants murdered several civilians in the republic, including Russian tourists. In response, a shadowy vigilante group called the Black Hawks threatened the relatives of some of the Islamists.[29] Dzhappuyev and Shameyev were killed in a special operation by security forces in April 2011.[30]