Belgian authorities announced on Monday that they had briefly held and questioned two Israeli citizens who recently attended an electronic music festival in the country, after pro-Palestinian groups accused them of war crimes.
Prosecutors said they received legal complaints alleging that two Israeli soldiers responsible for "serious violations of international humanitarian law" in Gaza were spotted at the Tomorrowland festival near the northern city of Antwerp last week.
The federal prosecutor's office said it had "asked the police to locate the two people named in the complaint and to interview them."
"Following these interviews, they were released," it said in a statement.
The office said that it took action after concluding that Belgian courts have extraterritorial jurisdiction over alleged war crimes.
"No further information will be given at this stage of the investigation," the office said.
The individuals have not been named.
Last week, the Hind Rajab Foundation (HRF), a Belgian pro-Palestinian organisation, said it had identified two Israeli soldiers "responsible for grave international crimes" in Gaza among the crowds at Tomorrowland.
It claimed that a group of young Israeli men was seen at the festival waving a flag of the Givati Brigade, an Israeli military unit involved in the fighting in the Palestinian territory.
HRF said it then filed a complaint with prosecutors in association with the Global Legal Action Network, a lawyers group specializing in human rights violations.
On Monday, it praised prosecutors for following up on it.
"At a time when far too many governments remain silent, this action sends a clear message: credible evidence of international crimes must be met with legal response – not political indifference," HRF said in a statement.
One of the world's largest electronic music festivals, Tomorrowland draws music enthusiasts from all over the world.
