Greece violence continues before boy's funeral

ATHENS, Greece (CNN) -- More violence was expected in Greece Tuesday ahead of the funeral of a 15-year-old whose fatal shooting by police has sparked days of rioting across major cities.

Authorities have vowed to reimpose order after the worst civil disorder to hit the country for decades left dozens injured, caused massive damage to property and challenged an increasingly unpopular government.

Greek Prime Minister Kostas Karamanlis vowed again Tuesday that those responsible for the violence would be punished.

"I assured the president that no leniency will be tolerated in holding people accountable," he told reporters Tuesday. "No one has the right to use this tragic incident as an alibi for actions of raw violence."

Riots broke out Saturday in Thessaloniki and Athens after the shooting of 15-year-old Alexandros Grigoropoulos by police. Two officers have been charged over the shooting.