Turkish leaders will hold no further campaign rallies in Germany before Turkey's April 16 referendum, organizers said on Tuesday, after an ally of German Chancellor Angela Merkel said they were not welcome.

The announcement by the Union of European Turkish Democrats (UETD) underscored a sharp deterioration in relations between NATO allies Germany and Turkey ahead of the referendum on boosting the powers of Turkish President Tayyip Erdogan.

"We will not organize any further events with Turkish government officials before the referendum," UETD President Zafer Sirakaya told Germany's Wirtschaftswoche magazine. Sirakaya was not available for immediate comment but an UETD spokeswoman confirmed the quote as reported by the magazine.

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