On September 10, 2019, through its regular event-based surveillance process, WHO received unofficial reports regarding the death of a person with suspected Ebola Virus Disease (EVD) case in Dar es Salaam, United Republic of Tanzania. On September 11, 2019, through its regular event-based surveillance process, WHO was made aware of unofficial reports that a RT-PCR test performed at the Tanzanian National Health Laboratory was positive for EVD for this patient. On the same day, WHO received unofficial reports regarding another suspected EVD case in Mwanza, located in the northern region of the United Republic of Tanzania, who later tested negative for EVD. On September 12, 2019, WHO was informed by unofficial sources of a 27-year-old patient suspected of EVD admitted in a hospital of Dar es Salaam without further information regarding laboratory tests and results. Despite several requests, WHO did not receive further details of any of these cases from Tanzanian authorities.