Clubbers at a foam party in Archangel ended up in hospital with chemical burns to their eyes, Itar-Tass reported.
On Sunday, 36 people were taken from the nightclub, M33, to the local hospital where they were given painkillers and had their eyes washed, doctor Vladimir Kabanov said.
The victims are still in hospital receiving treatment, according to several sources.
No reports regarding the incident have been received by the police, but an investigation is underway, the local Interior Ministry said.
Until recently, M33 was associated with former United Russia deputy Vladimir Krupchaka, who was a regular at the club, RBC Daily reported.