The demonstration marks the 13th consecutive protest since the December 17 parliamentary and local elections, which saw Serbian President Aleksandar Vucic's party claim a commanding victory.

Organized by ProGlas, the Serbian pro-democracy movement, the protest was attended by people from various opposition groups, including the main coalition "Serbia Against Violence." Claims of major election law violations in both the Belgrade city and parliament races have fueled opposition to the election results.

Among the grievances voiced by the protesters are allegations of irregularities, including the illegal casting of ballots by ethnic-Serb voters from neighboring Bosnia in the capital. International observers also reported irregularities, leading several Western nations to express concern about the electoral process.

The demonstration began with a 24-hour blockade of streets in central Belgrade, primarily by students from the Borba ("Fight") movement. These students are calling for the annulment of the election results and for new votes to be held. The students, some as young as 18 and 20 years old, have faced charges of overthrowing the constitutional order and have been placed under house arrest.

Speaking at the rally, Emilija Milenkovic, one of the student leaders, questioned the fairness of the elections and demanded that their voices be heard. She thanked her colleagues for enduring the street blockade and reiterated their call for fair representation within the polling stations.

The appearance of opposition leader Marinika Tepic, who had been on a hunger strike since December 18, brought renewed energy to the protesting crowd. Tepic addressed the demonstrators before going to the hospital and announcing the end of her hunger strike.

The protest continued with the demonstrators marching towards the Constitutional Court, with the Terazije fountain serving as a symbolic location. It was at this fountain where one of the first major demonstrations against former Serbian strongman Slobodan Milosevic took place during the "Plush revolution" in March 1991.

The Serbian Progressive Party (SNS), led by President Vucic, has been in power since 2012. In the parliamentary elections, the SNS secured approximately 46 percent of the votes, while the leading opposition coalition received 23.5 percent, according to the official results.

As tensions escalated, Sunday saw protesters attempting to storm Belgrade city hall using flagpoles and rocks. However, the police responded with pepper spray, leading to the arrest of over 30 individuals.

The opposition continues to demand that the election results be annulled and new votes conducted, while the government stands firm in claiming victory. The situation remains tense as both sides navigate the aftermath of the controversial elections.