The bodies of Michael Sharp , Zaida Catalan and interpreter Betu Tshintela were found late last month in a shallow grave in Democratic Republic of Congo’s Central Kasai province.
They had been looking into alleged human rights violations by the Congolese army and local militia groups. Three other local members of their team remain missing.
Their deaths raised an outcry, with Sweden opening a murder investigation and DRC’s President Joseph Kabila vowing punishment for those responsible.
The prosecutor of the International Criminal court has said the killing of the UN investigators and other violence in DRC could be crimes under her court’s jurisdiction.