According to the report, 146 men and 115 women were arrested, and authorities seized alcohol, banned under the Islamic Republic’s laws, along with psychedelic drugs.

Those detained had “signs and symbols of satanism on their clothes, head, face, and hair,” according to Tasnim which is linked to the Islamic Revolutionary Guards (IRGC).

The media outlet also published photographs showing masks, model skulls, and T-shirts depicting skulls.

The report did not specify the nationality of the Europeans, and there is no independent confirmation of the nature of the gathering raided by the police.

The raid comes amid a nationwide crackdown by Iranian authorities on women accused of violating the strict Islamic dress code.

Across Iran, there have been increasing reports of young people being detained for participating in "mixed parties" and refusing to wear hijabs.

As the regime’s “morality police” intensify their operations, many detainees are being whipped with lashes as punishment.

State news agency IRNA reported, “The Police Information Centre announced the identification, dismantling, and widespread arrest of members of the satanist network.”

In July 2009, police arrested three people in the northwestern province of Ardebil over “satan worship”.