BELGRADE: 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.

Incidents first started on Tuesday evening in Vrbas, northwest of the capital Belgrade, where riot police separated protesters from the opposed camps outside the ruling Serbian Progressive Party offices in the town.

Video footages from the scene showed government supporters throwing flares, rocks and bottles at the protesters, who hurled back various objects. Police said dozens of people were injured, including 16 policemen. Similar incidents were reported at protests in other parts of the country.

The student-led protests in Serbia first started in November after a train station canopy collapse in the northern city of Novi Sad killed 16 people, triggering accusations of corruption in state infrastructure projects.

Protests have since drawn hundreds of thousands of people, shaking Vucic’s firm grip on power in Serbia. The president’s supporters have recently started organizing counter-demonstrations, fueling fears of violence.