Two police officials and a demonstrator were shot and killed as the worst violence Yugoslavia has seen in eight years swept through the southern province of Kosovo. It was the fifth straight day of rioting by ethnic Albanians who object to government moves to curb the province’s autonomy. They stoned police and property in at least nine towns, including the area’s capital, Pristina, 150 miles south of Belgrade. Demonstrators opened fire in the town of Podujevo, killing Police Chief Jetulah Kuchi, 39, and wounding a second policeman, a police technician and two civilians. Another police officer and a demonstrator were shot to death in riots at the nearby mining town of Titova Mitrovica.