GETTY The alleged attacks took place at the annual Schlossgrabenfest music festival

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Three Pakistani men are already under arrest after 18 women filed complaints alleging they had been improperly touched, fondled and groped during the festival in the city of Darmstadt. Police have said the number of complainants could rise.

At least 15 more women are expected to come forward to file criminal complaints

Between two and three more men are still being sought by police as victims receive counselling and authorities try to cool down rising tensions. As in Cologne on New Year's Eve, when asylum seeking men moved in hunting packs through the concourse of Cologne main railway station to rob and sexually attack hundreds of young women, the Darmstadt men are alleged to have moved in groups to prey. All the complainants claimed they were "surrounded" by their tormentors before being "touched and fondled" improperly at the annual free Schlossgrabenfest music festival over the weekend. The three arrested men are aged between 28 and 31 and are Pakistanis seeking asylum in Germany.

GETTY The New Year's Eve sex attacks in Cologne sparked outrage across Germany

All have been charged with sexual crimes as the hunt continues for their alleged accomplices. Media reports said that at least 15 more women are expected to come forward to file criminal complaints after they were allegedly groped at the festival on Sunday, where around 100,000 people were in the crowds over the four-day event.

Cologne: Sex Attacks and Robberies Tue, January 12, 2016 Thirty-one suspects, including 18 asylum seekers, are under investigation over offences including sexual assault and theft in Cologne on New Year's Eve. Far right protestors in Lepzig have rallied against refugees and German chancellor Angela Merkel. Play slideshow Reuters•Getty 1 of 22 Protestors in Lepzig rally after over 100 women were sexually assualted on New Year's Eve