France, July 15 -- "We think, with some of our support and modelling, the scale of the outbreak is at least two to four times the number of cases we are finding," Dr Chikwe Ihekweazu, executive director of the WHO's Health Emergencies Programme, told reporters in Geneva after a visit to eastern Democratic Republic of Congo.

According to the DRC's latest official figures, the haemorrhagic fever has infected more than 1,960 people and killed more than 700 since it was detected two months ago. Cases have also been identified in neighbouring Uganda.

The WHO emergencies director added that its modelling shows the virus is spreading faster than ever seen before.

"This is now the third-largest Ebola outbreak ever, and we've seen the fastest g...