Greece's worst protests in decades have swept through more than 10 cities following Saturday's killing of 15-year-old Alexandros Grigoropoulos, leaving a trail of destruction with hundreds of cars and shops set ablaze.
According to the official report, an officer fired warning shots after a group of teenagers attacked their police car, and the boy was accidentally shot in the chest. The officer who fired the shots has been arrested over the killing.
Some 6,000 people attended the teenager's funeral on Tuesday in a southern suburb. The ceremony was relatively calm but later police used tear gas to disperse youths as violence erupted outside the cemetery when groups of teenagers started throwing stones.
Earlier in the day, a crowd of youths clashed with police guarding the Greek parliament in Athens. In addition, at least 70 stores and seven banks were set on fire in the northern city of Thessaloniki.
Police also used tear gas against students who had occupied the Athens Polytechnic and the neighboring Athens Law School, located in the area where Grigoropoulos was shot dead.
No information about casualties is available so far.
Many schools and universities were ordered to shut for two days on Monday ahead of a general strike planned for Wednesday over welfare reforms and economic policy.