Earshot NGO specialized for human rights audio investigations said a sonic weapon was used against protesters in Belgrade on March 15.

Earshot NGO specialized for human rights audio investigations said a sonic weapon was used against protesters in Belgrade on March 15.

Protesters in Serbia who staged one of the country’s biggest-ever rallies claim the authorities used a prohibited, military-grade sonic weapon to disperse peaceful crowds.

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Serbian rights groups say security forces illegally used a military-grade sonic weapon to disperse and scare protesters at...