A video posted on the NOVA media outlet, the location of which was confirmed by Reuters, showed armed security officers approaching a large tent outside parliament.
A few shots were fired and then a fire broke out inside the tent, one of several erected this year by supporters of President Aleksander Vucic during anti-government protests.
It was not clear who fired the shots or how the fire started.
Local police declined to comment.
NOVA said that one person was injured. N1 TV said a 57-year-old man was wounded by a gunshot and is in a stable condition.
Another video posted on X showed a man lying on the ground with his hands behind his back and surrounded by police officers.
(Reporting by Antonis Pothitos; Editing by Edward McAllister and Philippa Fletcher)
epa12421471 Protestors wave a Serbian flag during a commemorative march for the sixteen victims of the Novi Sad train station accident, in Belgrade, Serbia, 01 October 2025. The march was organized by university students after the collapse of a railway station canopy on 01 November 2024, which killed 16 people, and has since grown into demands for early elections. EPA/ANDREJ CUKIC