Gorgoroth's concert in Krakow was recorded by state TV station TVP and the resulting scandal was the center of attention in Polish media. The band is now being investigated for causing religious offense, which can be punished by two years in prison.
The police are also considering an investigation of cruelty to animals.
"On stage there was blood everywhere. About ten decapitated sheep heads and naked people, alive, on large crosses. Everyone was painted with 100 liters of sheep blood. Also there were Satanist symbols everywhere. One of the hanging female models fainted and an ambulance had to be called," TVP director Andrzej Jeziorek told VG.
Jeziorek said that the TVP staff were terrified and reported the show to police.
"This kind of thing should not happen on state TV and especially not in Krakow, which is the Pope's city," Jeziorek said. Jeziorek wanted to halt the concert but feared a riot from enthusiastic, bloodied fans who had paid for tickets.
The band were recording a concert DVD and had promised fans a very special show in Poland, and had rigged the stage behind curtains to keep the content secret.
Recent troubles with sects and Satanist groups have made the issue especially sensitive in Poland.
Aftenposten English Web Desk