Serbian officials have denied allegations security forces deployed a military-grade Long Range Acoustic Device.

Acoustic or sonic weapons are devices that deliver very loud sounds over long distances. They can be designed to emit painful audible or inaudible sound waves

The Serbian government has been accused of using a sonic weapon against anti-government demonstrators during a protest in Belgrade, Serbia. At around 7 p.m. local time on Saturday, during a 15-minute silent vigil,