Athens has again been the scene of violent protests, as police and demonstrators clash on the first anniversary of the death of 15-year-old Alexandros Grigoropoulos.
Alexandros's family had appealed for Sunday's anniversary to pass off peacefully, but a huge march through Athens soon led to trouble.
Anarchist groups set up roadblocks and confronted police with sticks, rocks and petrol bombs.
In response, riot police confronted the protesters and soon running street battles were taking place in the city.
Officers on motorcycles formed snatch squads to arrest rioters, but those who fell from their machines met with violence from the crowd.
Police responded with baton charges and tear gas and made scores of arrests as the violence flared.
Violence also broke out in Greece's second city Thessaloniki where several people were injured.
Despite the violent scenes, correspondents say the situation in Athens was not as bad as last year's riots, which lasted for nearly two weeks.
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