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Deutsche Welle

Turkish Muslims are the largest immigrant group in Germany and almost four million Germans go to Turkey each year as tourists. In theory, this should be a great relationship, however, fellow citizens of Islamic faith are viewed with suspicion.

And since Turkey's election of Islamic-conservative Prime Minister Erdogan, there have been speculations about the activities of imams and preachers sent by Turkey to the German mosques.

Report: Susanne Güsten / Eva Wutke