An NGO specialized for human rights audio investigations said on Monday that a sonic weapon was used against protesters in Belgrade on March 15. Pročitaj više

The Earshot NGO said in an X post that it examined 12 videos of the moment that a sonic weapon was allegedly used. The post said that “4 of these videos contain a sound consistent with the noise produced by a Vortex Ring Gun or Vortex Cannon”.

“As this weapon pushes gas out of its cylinder at speeds of 185mph, its expulsion produces a howling noise which has been compared to a jet engine, along with vortex rings that may be ionized. This would create electromagnetic interference with devices such as hearing aids, corroborating reports made by witnesses at the protest,” the post said.

It added if this turns out to be the vortex cannon, these recordings would be more than 700m away. “At this distance the combustion of the weapon is no longer audible; only the distinct whistling sound of the pressure wave as it travels away from the shooter location and towards the crowd can be heard, causing mass panic,” it said.

Earshot called anyone with video footage of the incident to contact them so that it can investigate further.

The Earshot web site that it is the world’s first not-for-profit organisation producing audio investigations for human rights and environmental advocacy, using cutting-edge audio forensic analysis techniques,

The vortex ring gun is an experimental non-lethal weapon for crowd control that uses high-energy vortex rings of gas to knock down people or spray them with marking ink or other chemicals.

On the 16th of March 2025, Earshot was contacted by activists in Serbia to investigate the potential use of sonic weapons by the government on a crowd of protestors as they were holding a silent vigil for the victims of the Novi Sad railway station canopy collapse.

Earshot… pic.twitter.com/vLGovbQYfm

— earshot.ngo (@earshot_ngo) March 17, 2025