Some 800 people in the north German port city of Hamburg demonstrated Saturday in support of students in Greece involved in recent clashes with police, dpa reported.
Hamburg police broke up the protest after bottles and fireworks were thrown at officers as the demonstrators attempted to march from the University of Hamburg to the city's main railway station.
Afterwards, some of the protesters gathered outside the Greek consulate-general for an evening vigil. Police, backed by water cannons, were out in force near the building.
More than 100 people have been injured and about 400 have been detained during two weeks of protests in Greece triggered by the police shooting death of a teenager. Hundreds of shops and banks have been firebombed, vandalized and looted.
The policemen accused of killing the youth have been detained and charged with manslaughter.