Gustav Schaefer, drummer of the German pop-rock band Tokio Hotel, was reportedly injured in a fight at a German nightclub on Sunday.

Schaefer, 20, was injured at a club in his hometown of Magdeburg according to the band’s manager. Police have also confirmed the incident to Bild.de, a German news site.

“In one of Magdeburg’s night clubs, a stranger smashed two beer bottles on the head of Gustav,” David Jost, the band’s manager and producer, said in a statement. “Gustav had to be treated in the hospital with 36 stitches. The police [are investigating] aggravated assault.”

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