Islamist militants from the North Caucasus have claimed responsibility for the killing last month of a Russian Orthodox priest.
A statement on a website linked to Chechen rebels, kavkazcenter.com, said Daniil Sysoyev had been killed by a man who had sworn loyalty to Doku Umarov.
Umarov is the self-proclaimed leader of the "Caucasus Emirate" that has sought to unite militant Islamist groups in Russia's North Caucasus and establish Islamic Shari'a law in the region.
There was no way to verify the claim of responsibility.
Sysoyev, who had been an outspoken critic of Islam, was shot dead in his church in Moscow by an unknown assailant.
compiled from agency reports