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(Image: VISITLAGENFURT.AT/GETTY)

The shocking incident reportedly happened at a swimming pool in the town of Geldern, Germany.

The leisure centre is welcoming of people who prefer a more "natural" way of swimming, as well as those who wear bathing suits.

According local news reports, the six men in their mid-20s, who had full Islamic-style beards, started abusing men, women and children swimming naked.

(Image: GOOGLE)

A nudist mother said to newspaper Junge Freiheit that they told her: “We [German] women are all sl**s and they would exterminate all of us.”

“This contempt, this potential for aggression made me really afraid."

The group also allegedly referred to swimmers' "indecent behaviour" and spat at women and children in the pool.

A worker at the leisure centre, Lisa-Marie Theunissen, told German media that she and colleagues asked them to be quiet, but they then started abusing staff members before they were ejected from the premises.

Although there is no suggestion the men involved were migrants, the issue of abuse and sex attacks at German pools has been a growing problem.

In April, a 20-year-old Iraqi man defended violently raping a 10-year-old boy after dragging him into a changing room cubicle at a pool in Germany, saying it was a "sexual emergency".