The rally in an industrial area along the Rhine River brought together pro-Kurdish demonstrators and members of the Alevi religious minority protesting Erdogan's crackdown after a failed coup attempt in Turkey this summer.
A group of about 200 to 300 Kurdish youth broke away from the main protest and several were taken into custody after throwing stones and bottles at police, authorities said. One police officer was slightly injured.
Police say many of the youth were wearing masks, and some were displaying banned symbols of the Kurdistan Workers' Party, or PKK.
The PKK has waged a three-decades-long insurgency against the state, and Erdogan has blamed countries in Europe for supporting and arming the group.
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