Did Serbian authorities use sonic weapons in Belgrade?

On Saturday, a large student rally in downtown Belgrade to honor victims of a railway station collapse experienced intense panic due to a loud, mysterious noise. Speculations suggest a 'sound cannon' or 'vortex cannon' might have been used, though Serbian authorities deny deploying any acoustic weaponry. Many attendees sought medical assistance for lingering symptoms.

Did Serbian authorities use sonic weapons in Belgrade?
On Saturday, a large student rally in downtown Belgrade to honor victims of a railway station collapse experienced intense panic due to a loud, mysterious noise. Speculations suggest a 'sound cannon' or 'vortex cannon' might have been used, though Serbian authorities deny deploying any acoustic weaponry. Many attendees sought medical assistance for lingering symptoms.