Instead of traditional street partying on New Year's Eve, tens of thousands of protesters led by university students have gathered overnight in Belgrade and other Serbian cities to demand political reforms and justice in the Balkan country.

Tens of thousands of people gathered in central Belgrade on Sunday to protest against President Aleksandar Vucic and his ruling Serbian Progressive Party (SNS), whom they blame for a railway station roof collapse last month that killed 15 people.

The rally at Belgrade’s Slavija Square, one of the largest in recent years, was called by students and farmer unions. It was part of a wider movement demanding accountability over the Nov. 1 collapse of a canopy at a railway station in the country’s north that killed 15 people.