Said Atsayev (L), a leading Sufi Muslim cleric in the mostly Muslim region, addresses the audience during the Dagestan Peoples Congress in Makhachkala in this December 15, 2010 file photo. A female suicide bomber killed an Islamic spiritual leader and at least five other people on August 28, 2012, in the Dagestan region in Russia's North Caucasus, a police source said. Said Atsayev, a leading Sufi Muslim cleric in the mostly Muslim region, was killed along with five followers and the bomber at his home in the village of Chirkey, the source said. REUTERS/Sergei Rasulov/NewsTeam/Handout/Files (RUSSIA - Tags: CRIME LAW RELIGION) THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS