BELGRADE, Serbia — Angry protesters clashed with police in a town in western Serbia and in the capital Belgrade on Saturday as tensions soared further in the Balkan nation following days of violent demonstrations. Wearing scarves over their faces and chanting slogans against President Aleksandar Vucic, a group of young men threw flares at his Serbian Progressive Party offices in Valjevo, some 60 miles from the capital Belgrade. They set fire to the party's offices before clashing with riot police in a downtown area.

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