Berlin on Friday warned Ankara against interfering in how people in Germany practised their religion, as a new row erupted over a new "liberal" mosque in the German capital.
A Friday prayer in Munich's Marienplatz was supposed to raise awareness about the lack of mosques in the city centre. But it has been cancelled "for security reasons."
A high school in the western city of Wuppertal has come under fire after a letter was circulated stating that teachers should take down names of Muslim students found praying at school.
Outside of Berlin there are only two mosques in the whole of the former East Germany. The populist Alternative for Germany (AfD) are trying to scupper plans for a new one in Erfurt, state capital of Thuringia.