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.

The offices of the the ruling Serbian Progressive Party (SNS) have been set on fire during a fifth night of unrest in a row that saw fresh clashes between anti-government protesters and riot police.

Protests against the government of President Aleksandar Vučić in Serbia saw a fourth consecutive day of violence on Saturday night. The most severe riots occurred in the central town of Valjevo, where opponents of the government set fire to the office of Vučić's Serbian Progressive Party (SNS) and damaged buildings of the city administration and the local public prosecutor's office.