Berlin: Dresden police are searching for a man - described as sporting a Hitler moustache and wearing a Nazi-style helmet emblazoned with a swastika - who assaulted an Afghan immigrant on a sledding hill in eastern Germany.

Police said Tuesday the man approached two Afghan men, aged 21 and 26, on Saturday in Geising, south of Dresden. Witnesses say the attacker insulted them, and then hit the younger man on the head, knocking him to the ground.

After passers-by intervened, police say the man showed the stiff-armed Nazi salute, and then fled the scene.

The man, who is being sought on charges of assault and the display of banned symbols, is described as strongly built, about 25-30 years old, with a shaved head.

Police are appealing to the public for any information.