Yazidi rights activists and a former prosecutor of the International Criminal Court are talking to Yazidi refugees in a northern Greek camp, hoping to build a case for the Hague-based court.

Luis Moreno Ocampo, who was the court's first prosecutor, said Monday that it is very important for members of the Yazidi minority that the world recognizes them as victims of genocide.

About 1,300 Yazidis live in the camp near the village of Petra Olympou under Mount Olympus. They fled attacks in Iraq and Syria from the Islamic State group, which killed thousands and enslaved thousands more, mainly women and children.

Among the visitors to the camp was prominent Yazidi activist Nadia Murad, who managed to escape IS slavery and has since campaigned for the minority's cause.