Serbian President Aleksandar Vucic is projected to win a second term in office.

According to preliminary results from IPSOS and CEDSID published Sunday night, the populist president's ruling Serbian Progressive Party received nearly 43% of the vote, based on 90% of ballots counted.

Trailing far behind were centrists rival the Alliance for Victory coalition with 13.5% of the vote and the Socialist Party of Serbia with 11.4%, according to the figures.

Vucic declared victory before supporters at his party's headquarters on Sunday night, stating the win will make him the longest-serving leader since Nikola Pasic, who was the prime minister of Serbia and then of the former Yugoslavia in the early 20th century.

"I want to say that I am proud of our campaign, which was the cleanest and most beautiful, and that I am proud that we have not slandered anyone," Vucic said, Balkan Insight reported.

Non-profit Serbian organization Center for Research, Transparency, and Accountability reported about an hour ahead of polls closing at 8 p.m. on Sunday that voter turnout was 55.1%, higher than the 53.1% that turned out for the 2016 parliamentary election 2016 and the 45.5% that voted in 2020.

There have been reports of irregularities during the election including incidents of alleged vote-buying and pressure on observer teams as well as violence, with Pavle Grbovic, the leader of the opposition party Movement of Free Citizens, being attacked near a polling station at a Belgrade suburb, the local news organization reported.