Health officials believe an Ebola outbreak in central Africa began weeks earlier than first detected. Multiple outlets report that investigators have not yet identified the original source of the outbreak. The situation is reported to be unfolding across the region, with references to cases in both Congo and Uganda in the coverage. The World Health Organization (WHO) has declared the outbreak a public health emergency of international concern, a designation used when an event is considered a serious, unusual public health risk with potential to cross borders. PBS NewsHour reports that the death toll has risen to more than 100, while other outlets focus on the delay between the likely start of transmission and when it was recognized. The available accounts describe ongoing work by health authorities to map transmission, confirm cases, and strengthen public health response measures. Overall, the reports emphasize the elapsed time before detection, the ongoing uncertainty around how the outbreak began, and the WHO’s decision to raise the international alert level.