Police used tear gas to disperse stone-throwing youths during an anti-racism protest in Thessaloniki on Monday, authorities said. No arrests or injuries were reported, according to AP. Police said the trouble broke out during a demonstration by some 400 human rights activists and African immigrants outside a precinct in the Thessaloniki suburb of Kalamaria. Suspected anarchist youths in hoods and motorcycle helmets threw sticks and stones at officers, damaged three cars and a shopfront and destroyed two telephone booths, police said. The protest followed the death of a Nigerian immigrant who fell out of a window in a Kalamaria cafeteria early Sunday. Police said the 25-year-old man was a vendor of pirated CDs who panicked after he saw two men watching him and mistook them for plainclothes police. Human rights activists claim the two men were officers who chased the immigrant to his death. Angry immigrants, joined by suspected anarchists, threw stones and chairs at police outside the cafeteria on Sunday, lightly injuring three officers.