Riot police have clashed with demonstrators in central Athens, sending Christmas shoppers running for cover.
The protesters, who had broken away from a peacefully rally, threw rocks and petrol bombs at police and buildings near the Greek parliament.
They also overturned a car, set fire to rubbish bins and splashed police with red paint.
Police officers responded by firing tear gas on the crowd.
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It is the 13th day of anti-government demonstrations since police shot and killed 15-year-old Alexandros Grigoropoulos.
A d v e r t i s e m e n t
Protesters also tried to burn down the main Christmas tree in Athens, unveiled earlier this week as a replacement for the original one which was torched during previous violence.
Parents picked up their children from the Christmas carousel in the main square and fled when the clashes began.