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,

The incident left 15 people dead, with protesters blaming President Vučić’s government, alleged corruption, and a lack of safety regulations. Reports in Serbian media said 22 people were arrested and 56 were injured during the protests.

The Serbian government denies using a military-grade sonic weapon against protestors during a major anti-government rally in Belgrade. Opposition and rights groups plan to file charges, alleging the weapon caused panic and injury.