It was not possible to confirm the causes of death because patients or their relatives in Kigonze camp in Bunia - the epicenter of the Ebola outbreak in the Democratic Republic of Congo - had until Thursday refused testing the living or dead, a camp spokesperson said.

However, all had symptoms including headaches, fever and vomiting, which are associated with Ebola, a camp spokesperson, three aid sources and a civil society ​leader told Reuters.

The deaths in Kigonze, which has more than 15,000 residents, raise fears that Ebola may ​be circulating undetected among eastern Congo's over 5 million displaced people, with resistance to testing compounding the challenge posed by severely limited sanitation measures.