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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 received 12 videos that document the moments where a weapon was allegedly used against the protestors. 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. Should this 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. As Earshot is looking to further investigate this incident, we ask anyone with video footage from that night that captures the specific sound that can be heard in this post to get in touch with us.