Riot police in Bulgaria arrested some 120 people over the weekend during some of the worst ethnic clashes in years.The violence was sparked Friday night in Katunitsa when 19-year-old ethnic Bulgarian was killed after being run over by a van whose driver was linked to the Roma clan leader Toma Tsar Kiril Raskov.Villagers gathered in front of one of Raskov's houses throwing stones and demanding the banishment of his family.Five people were injured and one 16-year-old with a pre-existing heart condition died during the protests which involved some 2,000 peopleBulgaria's prime minister called the conflicts acts of violence and denied they were motivated by racial tensions.