Prosecutors have opened criminal proceedings against four people associated with a mosque in the city of Winterthur for public incitement to crime and violence.

Police descended on the An'Nur mosque on Wednesday morning to conduct a search of the building and three other houses in the area after receiving evidence against four people, Zurich's public prosecutor's office said in a statement.

The investigation relates to a sermon given by the mosque's Ethiopian imam on October 21st in which he "called for the murder of Muslims who refuse to participate in communal prayer", said the statement.

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