The video, which is now causing a stir in Berlin's political circles, is just 15 seconds long. It shows young people on the terrace of an expensive restaurant on Sylt, the North Sea island much frequented by wealthy German holidaymakers.

The short sequence was recorded on what appears to be a mild early summer evening, with the first glow of sunset in the background. The young people are wearing smart-casual clothes and dancing. Five of them are chanting: "Germany for the Germans, foreigners out."

And at least one of the participants appears to be giving the Hitler salute, holding two fingers between his upper lip and nose, as if to imitate a Hitler mustache.

On Thursday, the Pony nightclub in the posh town of Kampen on the island distanced itself from the video on Instagram. The video was made outside the nightclub, apparently without the proprietors' knowledge.

"We are deeply shocked," owner Tim Becker said in a statement. "Every guest is........

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