Police use water cannons against demonstrators
May Demo escalated in Metro Station
In Berlin and Hamburg, there are at demonstrations on May 1, clashes with the police. The officers put in Hamburg a water cannon. In Berlin, there are the first arrests of troublemakers.
Source: The World Against war, crisis and capital: Around 20,000 people took part in the Revolutionary May 1st demonstration in Berlin. Shortly after the end of the rally it comes to escalation.