Satarov had followers in several other cities in Tatarstan and other Volga River provinces, local media reported.

In a 2008 interview with the Komsomolskaya Pravda daily, Satarov said that he fell out with other clerics and authorities in the Communist era, when he said the KGB sent him to Muslim nations with stories about religious freedom in the officially atheist Soviet Union. Government-approved Orthodox Christian, Muslim and Jewish clerics routinely traveled abroad on Soviet publicity trips.

"That's how I became Satan's servant, a traitor," the white-bearded and turbaned man was quoted as saying. "When I understood that, I repented and started preaching."

Muslim leaders in Tatarstan said Satarov's views contradict Islamic doctrine.

"Islam postulates that there are no other prophets after Mohammad," Kazan-based theologian Rais Suleimanov told the Gazeta.ru online publication Tuesday.

Police raided Satarov's house last Friday as part of an investigation into the killing of Valiulla Yakupov, Tatarstan's deputy chief mufti, who was gunned down in mid-July as he left his house in Kazan. Minutes later, chief mufti Ildus Faizov was wounded in the legs when a bomb blast ripped through his car in Kazan.

Both clerics were known as critics of radical Islamist groups that advocate a strict and puritanical version of Islam known as Salafism.

Prosecutors have named two suspects in Yakupov's killing who remain at large and arrested five others in the case.