The World Health Organization (WHO) on Friday warned that a deadly Ebola outbreak in the Democratic Republic of Congo (DRC) is spreading quickly, even as response efforts are being scaled up.

The fatal Ebola outbreak in the Democratic Republic of Congo is spreading rapidly, the World Health Organization warned Friday, despite accelerating efforts to tackle the virus.

"The outbreak remains serious" and is "evolving so fast", said Marie-Roseline Belizaire, the WHO Africa emergencies chief.