Rioting broke out yesterday in the northern Greek port of Thessaloniki as Nigerians, mainly young demonstrators, confronted the Police in that country after the death of a Nigerian immigrant.Greek television showed footage of dozens of smashed windows and several damaged cars. Police said the victim, whose name has not been made public, had been selling CDs and DVDs illegally, and that he jumped from the first floor of a cafeteria to escape a police inspection. His injuries were fatal and he died on the spot.