Clashes between mostly left wing protesters and police in Germany ahead of Mayday parades resulted in around fifty arrests last night.
In Hamburg demonstrators set fire to bins and threw stones and bottles. The windows of a bank were destroyed reportedly by a group of about eighty.
There were nine arrests in the city; 17 police officers and a passer-by were hurt.
In Berlin nearly six thousand police officers including reinforcements from other regions have been deployed to try to keep order.
There has been anger in Germany at plans to allow the extreme right to demonstrate on Mayday.
34 people were reported to have been held briefly in two districts of the capital. A small number of far-right demonstrators were also arrested as they protested against a left-wing rally.
The night before May 1st is a traditional occasion for parties in Germany – but increasingly the event has brought outbreaks of violent.