BELGRADE, Serbia — Serbian officials denied Sunday that the country’s security forces used a military-grade sonic weapon to disperse and scare protesters at a huge anti-government rally in the capital.

Opposition officials and Serbian rights groups claimed that the widely banned acoustic weapon that emits a targeted beam to temporarily incapacitate people was used during the protest Saturday. They say they will file charges with the European Court of Human Rights and domestic courts against those who ordered the attack.

Serbia has not denied that it has the acoustic device in its arsenal.

At least 100,000 people descended on Belgrade on Saturday for a mass rally seen as a culmination of monthslong protests against Serbia’s populist President Aleksandar Vucic and his government.

Footage from the rally show people standing during 15 minutes of silence for the rail station disaster while suddenly experiencing a whooshing sound that immediately triggered panic and a brief stampede.

— The Associated Press