Images from the scene show government supporters throwing flares at the protesters who hurl back various objects.
Clashes have erupted as opponents and supporters of the Serbian government faced off, each side staging its own demonstrations, as sustained protests against populist President Aleksandar Vucic have now gone on for more than nine months.
The clashes first began on Tuesday night in Vrbas, northwest of the capital Belgrade, where riot police separated the two groups outside the governing Serbian Progressive Party offices in the town.
The student-led protests in Serbia first started in November after a train station canopy collapsed in the northern city of Novi Sad, killing 16 people, triggering furious accusations of corruption in state infrastructure projects.
Serbia’s president, other government officials and pro-government media have repeatedly described the protesters as “terrorists”, although protests since November have been largely peaceful.
Led by university students, the protesters are demanding that Vucic call an early parliamentary election, which he has refused to do.
Images from the scene showed government supporters throwing flares, rocks and bottles at the protesters, who hurled back various objects. Police said that dozens of people were injured, including 16 police officers.
Similar incidents were reported at protests in other parts of the country.
Police said that several people were detained in Vrbas. Police Commissioner Dragan Vasiljevic told state-run RTS television that the protesters “came to attack” the governing party’s supporters outside the party’s offices.
Protesters have said that government supporters attacked them first in Vrbas and also further south in Backa Palanka and later in Novi Sad and the southern city of Nis. In Belgrade, riot police pushed away protesters who gathered in a downtown area.
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Vucic said at a news conference on Wednesday with Austrian Chancellor Christian Stocker that pro-democracy protests in Serbia have been “very violent and were violent last night”.
Protests have, since November, drawn hundreds of thousands of people, rattling Vucic’s long-running presidency. The Serbian leader’s supporters have recently started organising counterdemonstrations, fuelling fears of further violence.
Serbia is formally seeking European Union membership, but Vucic has maintained strong ties with Russia and China, and has been accused of stifling democratic freedoms since coming to power 13 years ago.