A Danish nightclub has been accused of discrimination over its language requirements for entry by asylum seekers, prompting fears more establishments could follow suit amid a spate of reports of sexual harassment.

The Buddy Holly nightclub in the southern town of Sonderborg has hit the news after requiring customers to speak either Danish, English or German after women in several Danish towns hosting refugees complained of being harassed by asylum seekers.

While the club first introduced its language rule in 1997 -- long before the current wave of migration to Europe -- tensions over the migrant crisis have brought the issue back to the fore.

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