SERBIA’s weekend snap election was held in “unjust conditions,” with multiple reports of irregularities, international observers said on Monday.

Opponents of right-wing President Aleksandar Vucic took to the streets claiming the vote was rigged.

Political tensions spiked in the Balkan country over the parliamentary and local elections on Sunday. 

In Belgrade, several thousand people gathered in front of the state election commission headquarters, chanting “thieves,” as opposition leaders moved to lodge formal complaints claiming fraud in the city election.

Opposition politician Marinika Tepic said: “We have hundreds and hundreds of complaints.”

She and several other opposition politicians said that they will camp inside the state election commission’s headquarters.

At one point, protesters broke through a fence surrounding the building and one young woman tried to storm the entrance. Protesters threw eggs, tomatoes and rolls of toilet paper at the building.

The Serbian Progressive Party (SNS) won nearly 47 per cent of the ballots in the parliamentary vote, followed by Serbia Against Violence with 23 per cent, according to a near-complete preliminary tally by the state election commission.

If confirmed in the final vote count, the result means that the SNS will have an absolute majority in the 250-member parliament.