Activist: Inspectors said I'm part of 'first round' in 'sound cannon' probe

Bojan Simišić, founder of the environmental group Eco-Straža, reported being detained and questioned by police at the border after returning from abroad. Simišić told N1 that inspectors from the UKP (Criminal Police Directorate) informed him he was part of the "first round" of individuals to be investigated in connection with a "sound cannon."

Simišić explained he was stopped while returning from his summer job. He learned about the police looking for him through media reports, as he had not received any formal summons despite the police having his contact number. He anticipated being called in upon his return.

Upon presenting his documents to border police, Simišić was separated and taken to a room where he was searched and then interrogated about the alleged use of a sound cannon. When he asked why Eco-Straža was being targeted, the inspectors reportedly said, "You are like the first round; there will be many people."

The investigation stems from a large protest in Belgrade on March 15, 2025, organized by students. The event was disrupted by a sound described by attendees as similar to a low-flying plane or a fast-approaching vehicle. Authorities initially denied any such incident occurred but later it was revealed police possessed LRAD 450XL sonic devices, which they had previously denied owning or claimed were in storage. Investigations revealed the devices were mounted on police vehicles present in Belgrade that day. The Higher Public Prosecutor's Office in Belgrade requested an investigation into documents allegedly outlining plans to simulate the use of a "sound cannon" at the protest. Military analyst Aleksandar Radić, who first spoke about the potential use of a sound cannon, faces criminal charges and an arrest warrant for preparing acts against the constitutional order and security, and for revealing state secrets.

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You are like the first round; there will be many people.