Over 300 students gathered outside the police headquarters in an initially peaceful protest which turned violent when police used tear gas against demonstrators who threw eggs and stones. Around 100 people also demonstrated near the country's education ministry as students targeted the capital's main streets shutting down the city.
On the island of Lesbos and Ioannina, in western Greece, students took over local radio stations demanding they be allowed to make live broadcasts. A local newspaper in Ioannina was also attacked.
Riots have swept through Greek cities since the December 6 killing of Alexandros Grigoropoulos, 15, leaving a trail of destruction as youths went on the rampage looting shops and setting fire to hundreds of cars, banks and businesses.
An opinion poll published by the Ethnos newspaper on Sunday said 83 % of Greeks were unhappy with the methods used by the government to deal with the violence.
Two police officers have been detained over the teenager's killing. One of them, Epaminondas Korkoneas, who claims he fired warning shots in self-defense which ricocheted, was charged with murder and the illegal use of his weapon. The second officer, Vassilios Saraliotis, was charged with aiding and betting Korkoneas
