Twelve officers were injured in clashes with left-wing demonstrators following a far-right rally in Hamburg, German police said today.
Police spokesman Ralf Meyer said 60 people - mostly left-wing activists - were arrested over the clashes, which came after a demonstration against the far-right march.
Barricades and cars were set alight during the violence last night and police were attacked with bottles and stones.
Mr Meyer said an officer fired a warning shot after one police car was attacked.
The northern port city regularly sees clashes between police and left-wing demonstrators.