What is the acoustic cannon that was apparently used last night during the Belgrade protests?

Strange moment from the Belgrade protest – the crowded street emptied in a matter of seconds

A fight broke out near "Nikola Pashiq" square where a group of men beat a young man

"Not even a needle can fall there" – was this the biggest protest in Serbia's history?

Chaos in Serbia, students block RTS building – police also used force against them

A woman is injured during a clash between protesters and police security in front of the Belgrade Municipality building.

Another chaotic situation in Serbia, this time in front of the Belgrade Municipality building, citizens engage in massive clashes with the building's security.

Students block one of the largest traffic junctions in Belgrade – this will last 24 hours

Red Star Belgrade fans insult the US ambassador to Serbia in the gym, security intervenes to calm the situation

Another big protest in Belgrade, many people take to the city center - there were messages like "Your bloody hands"

The protester appears with a tractor in Belgrade, the Serbian police drag him away

Red paint on the floor of the Assembly of the city of Belgrade

Dramatic situation in Belgrade and Novi Sad, protesters clashed with the police - Vučić called an emergency meeting

Provocative messages in Belgrade and Novi Sad, after Trump's victory: "Make Serbia great again"

Huge amount of rain in a short time, Belgrade floods again - footage showing the chaos created