However, police forces across the country are on alert in case of further outbreaks of trouble.
Greece's worst riots in decades swept through more than 10 cities following Saturday's killing of 15-year-old Alexandros Grigoropoulos, leaving a trail of destruction as youths looted shops and set fire to hundreds of cars, banks and businesses.
Two police officers have been detained over the killing. One of them, Epaminondas Korkoneas, was charged with murder and illegal use of his weapon. The second officer, Vassilios Saraliotis, was charged with abetting his partner.
Lawyers for Korkoneas claim the boy was killed by a ricochet after he had fired a warning shot. Eyewitnesses maintain that the officer took aim at the boy before shooting.
Athens saw its calmest night on Thursday since the outbreak of the riots as heavy rain hit the Greek capital.
The results of a ballistic examination of the bullet that killed Grigoropoulos are due on Friday, and fresh student rallies are planned in Thessaloniki and Athens.
Some 4,000 students took to the streets of the capital on Thursday and clashed with police near the country's biggest prison.
