German police used water cannons during the Generation Z protests Youth protests in Germany turned into clashes with the police. In Cologne, water cannons were used against demonstrators, in Berlin and Hamburg, eggs, bottles and other objects were thrown at the police. There were fewer participants than expected. In general, according to police data, several thousand demonstrators took to the streets in Cologne, about 5,000 in Berlin and about 8,000 in Frankfurt am Main.