Two police officers have been arrested after the killing of a 15-year-old boy in Athens which sparked riots in the Greek capital.
Violence has also flared in the northern cities of Salonika, Komotini and Ioannina.
In Salonika a dozen banks and shops were torched by a crowd protesting at the teenager's death.
According to witnesses, the shooting occurred after a small group of youths threw stones at a police patrol car.
They said an officer responded by firing three shots, hitting one of them in the chest.