The four victims were lured one by one to a country cottage in the region of Yaroslavl on the Volga River, a popular Russian tabloid said.

The teenagers were then stabbed "666 times" each, as part of a Satanic ritual, the daily said, quoting investigators.

The victims were allegedly forced to get drunk before being stabbed and dismembered.

Their killers then lit a bonfire under a tree near the cottage where they cooked and ate their victims' body parts, the report claimed.

Hair from the victims was apparently found in the embers of the bonfire.

The report also quoted interrogations with the suspects and said police had intercepted their phone calls following the killings.

The victims - three girls and one boy - were all aged between 16 and 17 and belonged to local "goth circles", a subculture that is very popular in provincial Russia, Komsomolskaya Pravda said.