Thousands gathered in Belgrade on Sunday in an anti-government protest to demand the annulment of Serbia’s general election last week that was deemed “unjust” by international observers.

Protesters attempted to gain access to the City Assembly in Belgrade, using flagpoles and rocks to break the windows of the building, but were repelled by police using riot shields and tear gas, CNN’s Serbian affiliate N1 reported.

At least 35 people were arrested Sunday, according to N1, in what was the sixth straight day of protests since the parliamentary and local elections.

The ruling Serbian Progressive Party (SNS) won 47% of the votes after President Aleksandar Vucic called a snap election, cementing his decade-long grip on power in the Balkan nation that is seeking membership of the European Union while retaining close ties to Russia.

An international monitoring mission said the elections were held under “unjust conditions,” citing media bias, Vucic’s improper influence and “intimidation and pressure on voters, including cases of vote buying.”

Members of the center-left Serbia Against Violence coalition – a nascent opposition movement founded after months-long anti-government protests this summer – attended Sunday’s protest and accused Vucic of election theft.

“Vucic, you have stolen not one but thousands and thousands of votes,” Marinika Tepic, who has been on hunger strike since the elections, said at the protest. She called for the election to be annulled.

Srdjan Milivojevic, also a member of the opposition coalition, called Vucic a “thief like the world has never seen before.” He was seen attempting to open the door to the city hall, but was unable to enter.

“Vucic, go away,” the crowd chanted outside the building.

Responding to the protests in an address to the nation Sunday evening, Vucic told Serbs not to worry “because there is no revolution happening.”

“They won’t be able to accomplish anything with this, and let us try not to hurt any of the random demonstrators by reacting mildly, peacefully,” Vucic said, according to Radio Television of Serbia.

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