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.

Violence escalated across Serbia as anti-government protests entered their fifth consecutive night. In Valjevo, masked protesters set fire to the ruling Serbian Progressive Party (SNS) offices before clashing with riot police.

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.

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,

Fresh clashes erupted late Saturday between protesters and riot police in Serbia's capital Belgrade and other cities, on the fifth consecutive night of unrest.

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

UEFA has fined Partizan Belgrade more than $100,000 and ordered part of the Serbian club’s stadium closed at one European game for fans’ racist and political statements.