Demonstrators, reporters, and 14 police officers were among those injured.
Demonstrators - who were defying a ban on mass gatherings amid a spike in virus infections - threw bottles, rocks and flares at the police guarding the domed parliament building in central Belgrade. "You can protest as much as you need when the outbreak is finished", he explained.
Fourteen policemen were injured in the rioting Friday evening when hundreds of right-wing demonstrators tried to storm the parliament building in downtown Belgrade, police director Vladimir Rebic said Saturday.
I think we will be exposed to great, great, let me not say pressure, but expectations from our European partners, Vucic said.More news: Hyper Scape Open Beta Out
Many in Serbia accuse the increasingly authoritarian Vucic and his government of letting the virus crisis spin out of control in order to hold a paralimentary election on June 21 that tightened the ruling party's grip on power.
The protests started on Tuesday when the president announced that Belgrade would be placed under a new three-day lockdown following a second wave of confirmed coronavirus infections. "The state will prevail", he said and called for observing the government ban on any gathering of more than 10 people, imposed after the biggest former Yugoslav republic on Friday had its highest daily death toll from the coronavirus since the pandemic began.
Vucic has denied this, although authorities had relaxed the rules before the vote, allowing massive crowds at soccer games, tennis matches, and nightclubs.
Authorities reported 12 new coronavirus deaths on Saturday and 354 new infections, although there have been increasing doubts about the accuracy of the official figures.More news: San Francisco Giants star Buster Posey opts out of 2020 season
The country has had more than 18,000 confirmed infections and 382 deaths since March and health authorities have said hospitals are nearly full due to the latest rise in cases.
Protesters, most of whom wore masks, walked in front of the parliament building in the Serbian capital, occasionally calling for President Aleksandar Vucic to step down.
Vucic had earlier accused foreign actors of stoking the violence, and blamed "all kinds of interference from foreign security services".
Riot police used tear gas to repel the charge by a radical group following hours of a peaceful, sit-down rally by supporters of opposition parties. Vucic said the EU-backed process will be "meaningless" if they focus on whether Belgrade should recognize Kosovo's independence; Hoti said "mutual recognition between the two countries is the only way to normalize relations". Nationalist and far-right groups in Serbia oppose European Union membership and instead want closer ties with Russian Federation.More news: MLS postpones Toronto-DC United match after positive test