Serbia’s capital Belgrade is on edge ahead of a major rally this weekend with populist authorities of President Aleksandar Vucic ramping up efforts to dissuade people from attending.

BELGRADE, Serbia (AP) — As tensions in Serbia soar, students and other opponents of the populist president are gearing up for a major rally in the capital, Belgrade, over the weekend. Momentum has been building in favor of their demands for major changes in the Balkan country, after nearly four months of student-led anti-government protests.

Tensions were rising in Serbia days ahead of a mass anti-corruption protest as ultranationalist backers of the government flocked to the capital, sparking concerns of a confrontation between the rival camps.