Rammstein singer Mr Till Lindemann is being investigated over an assault case in a Hamburg bar. Witnesses told German media that the 54-year-old man insulted the heavy metal singer before the assault.
According to the Süddeutsche Zeitung and Bild daily newspapers, the incident began after a Rammstein concert in Munich on June 8.
Lindemann got into a verbal altercation with a fellow guest at the Bayerischer Hof luxury hotel in the historic city center.
The other guest, identified as being from Hamburg, was left with a nosebleed after Lindemann disappeared into his hotel room. Police have confirmed that an incident took place, but have given no further details.