Anti-corruption protesters in Serbia set fire to the Valjevo offices of the country's ruling political party, city leaders said, amid clashes sparked by the deadly collapse of a rail station in November.

Serbia's president on Sunday vowed a "strong" response to anti-government protests, after nearly a week of violent clashes involving his supporters, police and demonstrators across the country.

Serbia's police say they have detained scores of demonstrators who took part in anti-government protests throughout the country this week.

BELGRADE, Serbia -- Clashes erupted at protests in Serbia between opponents and supporters of the government in an escalation of tensions following more than nine months of persistent demonstrations against populist President Aleksandar Vucic.

The sometime actor and former Yugoslavian soccer player sold the eatery, which last year celebrated its 60th anniversary, to current owner Sonja Perencevic in 2009 before moving to Belgrade, Serbia.

BELGRADE: Serbia's President Aleksandar Vucic on Sunday announced tough measures against anti-government protesters following days of riots in the streets throughout Serbia that have challenged his increasingly autocratic rule in the Balkan country.

POLITICO spoke to an opposition lawmaker who said he was beaten by masked men as demonstrations were met with a violent response.