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Liberia has seen a significant reduction in the number of new Ebola cases, the medical charity Medecins Sans Frontieres (MSF) has confirmed, according to the BBC.

It said one of its treatment centres in Liberia has no cases at all at the moment - but warned Ebola was still on the rise in Guinea and Sierra Leone.

MSF, which employs thousands of staff across West Africa, is seen as the best-informed authority on Ebola.

Nearly 5,000 people out of about 14,000 cases have been killed by the virus.

Chris Stokes, the head of MSF's Ebola response, told the BBC that the decrease in the number of cases in Liberia presented an opportunity for health workers to step up their work.

But he said the disease could "flare up" again, pointing to Guinea, where the number of cases is rising again despite two significant lulls.

For the disease to be contained, Mr Stokes added, it needed to be tackled in Liberia, Guinea and Sierra Leone at once.

Of the West African countries hit by the 11-month outbreak, Liberia has seen the most deaths.

But last weekend its health ministry said two-thirds of the 696 beds in the country's treatment centres were empty.