Clashes between police and hooded youths continued in the night on the occasion of the nine year-anniversary since the killing of high-school student Alexis Grigoropoulos.
The clashes have moved to the infamous Exarchia neighbourhood of Athens where dozens of black-clad youths are throwing petrol bombs and rocks at police forces.
Police are responding with tear gas.
Earlier, disturbances also occurred in the area near the Greek Parliament during a protest march by students.
Some of the protesters set garbage containers on fire and hurled stones at police outside parliament.
Police fired teargas to disperse them, and formed protective cordons outside parliament and hotels in central Athens.
It has become a sad tradition that every year that central Athens becomes a battlefield in retaliation for the killing of Grigoropoulos by Epaminondas Korkoneas, the policeman who was later sentenced to life in prison.
In October 2010, Korkoneas was convicted for premeditated murder and his partner, Vassilis Saraliotis, was sentenced to 10 years in prison as an accomplice to murder.