Angry protesters have set fire to the offices of Serbia's governing populist party in a western town and clashed with police in the capital Belgrade in another evening of violent protests shaking the Balkan country.

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

Serbia's police used teargas and crowd control vehicles on Friday evening in Belgrade to disperse anti-government protesters who threw firecrackers and flares at police officers in what is seen as a major escalation of the nine-month-long protests.