Update 2019-10-19: Two demonstrations are starting at 11:00 a.m. local time on Saturday (19 October). The police is anticipating thousands of potentially violent protesters, some possibly armed with knives. Turkish nationalists will also stage a demonstration, besides Kurdish groups. Attacks against Turkish businesses, representative institutions, and passersby are possible.
Detailed information concerning times and locations of the protests are available via the links below.
Derwesten.de, OSAC, Polizei NRW
2019-10-17: A demonstration against Turkey's military offensive in Syria will be held in Cologne on Saturday (19 October).
Heightened security measures and local traffic disruptions are to be expected. Violent incidents are possible. Travellers should avoid demonstrations and follow instructions from authorities.