GETTY•IG The Muslim men reportedly stormed the pool shouting 'Allahu Akbar'

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The incident occurred at the naturist area of the Strandbad Xantener Südsee in Geldern, in the state of North Rhine-Westphalia, last Wednesday. Eyewitnesses said the six men, who were "apparently insulted" by the nudity, spat on the swimmers after branding them "sluts" and "infidels". One victim said: "They said women are all sluts and they would eradicate us all. This contempt and potential to be aggressive was very scary."

The men, who all had "full beards", burst into the pool moments after being asked to leave last Wednesday, according to employee Lisa-Marie Theunissen. They all had black hair and spoke German "very well", according to local media. They are not believed to be asylum seekers. Police have launched a probe into the incident, which took place in the western city of Geldern. The perpetrators were aged between 20 and 25, officers said.

ALAMY FILE PICTURE Police are interviewing witnesses in connection with the incident

Officers are interviewing witnesses and analysing CCTV footage in connection with the incident. Further suspects are thought to be identified soon. Germany and neighbouring Austria have been rocked by several reports of alleged sex attacks committed against women and children at pools this year. Earlier this month police in Duesseldorf confirmed a leaked report that said there were "grave worries" about the continuing trend.

GETTY FILE PICTURE Several sex attacks have been reported at German pools this year