Two Israelis questioned after attending Belgium's Tomorrowland festival

Police said the pair were detained after two pro-Palestinian groups alleged they had been waving flags from their army brigade.

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The men were briefly detained and then released after they had been interviewed, prosecutors said.

The Hind Rajab Foundation and Global Legal Action Network said they had filed a complaint after a group of young Israelis was seen flying the purple-and-white flag of the Givati Brigade, alleging the pair had committed war crimes in Gaza.

The Givati flag was among several Israeli flags waved during a set by Israeli DJ duo Vini Vici at Tomorrowland last Friday.

Prosecutors said no further details would be released about the case at this stage. The Hind Rajab Foundation called the arrest of the Israelis a "significant step forward".