KAMPALA, Uganda — The deadly Ebola virus has killed 14 people in western Uganda this month, Ugandan health officials said on Saturday, ending weeks of speculation about the cause of a strange disease that had many people fleeing their homes.

The officials and a World Health Organization representative told a news conference Saturday in Kampala that there is “an outbreak of Ebola” in Uganda.

“Laboratory investigations done at the Uganda Virus Research Institute … have confirmed that the strange disease reported in Kibaale is indeed Ebola hemorrhagic fever,” the Ugandan government and WHO said in joint statement.

Kibaale is a district in midwestern Uganda, where people in recent weeks have been troubled by a mysterious illness that seemed to have come from nowhere. Ugandan health officials had been stumped as well, and spent weeks conducting laboratory tests that were at first inconclusive.