Rammstein frontman Till Lindemann is being investigated by German prosecutors following multiple allegations of sexual misconduct.

According to a statement from Berlin’s public prosecution office, per an Agence France-Presse report, “Preliminary proceedings have been initiated against Till Lindemann on allegations relating to sexual offenses and the distribution of narcotics.”

The investigation stems from initial accusations made by a Rammstein fan and concertgoer, Shelby Lynn, who claims she was drugged at a Rammstein pre-show party and propositioned for sex by Lindemann at a concert in Lithuania.

Forgoing her anonymity, Lynn recounted her full story on Twitter, saying she was selected to attend the band’s “Row 0” concert party by Joe Letz, the drummer in Lindemann’s eponymous side project. She then said she was introduced to Lindemann, who poured her and other guests tequila shots. Lynn insinuated that the drinks may have been spiked, noting that her behavior and motor skills were compromised.