Police and protesters have clashed in central Athens during protests to mark the third anniversary of the fatal shooting of teenager Alexis Grigoropoulos by a policeman.
There were scuffles outside Parliament, where hooded youths threw chunks of marble and firebombs at riot police, who responded with tear gas and stun grenades.
Police said that three officers were injured and two protesters arrested. There were unconfirmed reports of several demonstrators being injured as well.
Streets in central Athens have been closed and Syntagma and Panepistimiou metro stations have also been shut.
Epaminondas Korkoneas, the officer who shot Grigoropoulos, was handed a life sentence after being found guilty of murder with malice aforethought.
Vassilis Saraliotis, a special guard who was found guilty of being an accomplice to the murder of Alexis Grigoropoulos in Exarchia in 2008, was released on parole in October.
Saraliotis originally received a 10-year-old prison sentence for his involvement in the Grigoropoulos case. The murder triggered some of the worst rioting ever seen in Greece.