Police in the German city of Cologne said Sunday they were boosting security around a campaign appearance by Turkey's economy minister, although there were no reported demonstrations planned.

Nihat Zeybekci is slated to speak at a private event in a central Cologne hotel on Sunday evening, after local authorities blocked two public rallies he had planned to woo Turkish expatriate voters for an April 16 referendum.

A police spokesman told AFP a police unit around 100 strong would be on hand if needed, but would not confirm details of the time or location of the event.

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