File Photo: Protesters carry a giant Palestinian flag during a "Justice for Palestine" march in solidarity with the Palestinian people in Brussels. AFP
Prosecutors said they received legal complaints saying 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 pair 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 said 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 killings in the Palestinian territory.
HRF said it then filed a complaint with prosecutors in association with the Global Legal Action Network, a lawyers group specialising in human rights violations.
One of the world's largest electronic music festivals, Tomorrowland draws music enthusiasts from all over the world.
About 400,000 people are expected to attend the event this year over two weekends.
Israel has killed more than 58,000 people in Gaza, mostly women and children.
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