A gym in the eastern German state of Mecklenburg-Western Pomerania has come in for criticism after it posted a notice in its window telling ethnic minorities they weren't welcome anymore, German media reported on Thursday.

The notice was posted by the Güstrow branch of the Easyfitness gym chain shortly after police arrested three suspected Islamists in the town on Wednesday. Die Welt reports.

The trio are suspected of having prepared "an act of violence that threatens the security of the state", said federal prosecutors in a statement. But the men were released shortly afterwards after a judge decided to reject the request to keep them in detention.

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