Clashes broke out between protesters and police during protests to mark the 17th anniversary of a teenager being killed by police.
In 2008, the fatal police shooting of 15-year old Alexandros Grigoropoulos on an Athens street triggered Greece's worst riots in decades.
The police officer was sentenced to life imprisonment but was released earlier by an appeals court.
Riot police monitoring Saturday's demonstrations used teargas and flash bombs and arrested several protesters.
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