Tokio Hotel rocker Tom Kaulitz is at the center of a police investigation after a female fan accused the star of punching her in the face at a gas station in Germany.

The guitarist, 19, is alleged to have assaulted the unnamed 21 year old devotee following a heated argument in Hamburg. According to Bild.de, the woman spotted Kaulitz - whose twin brother is band frontman Bill - as he sat in his car on the garage's forecourt and approached him to request a photograph.

However, in CCTV footage captured of the incident, when the star saw the fan, he winds down the car window and appears to throw a lit cigarette at her. She picks up the cigarette butt and stubs it out on the glass, prompting Kaulitz to get out of the car and seemingly strike the woman, leaving her with a black eye.

Police were called to the scene but Kaulitz had already fled by the time cops arrived to question the pair.

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(This news article provided by World Entertainment News Network)