The deadly Ebola virus is spreading in Sierra Leone because people are "actively resisting" medical treatment, a virologist has claimed.

Dr Ben Neuman, from the University of Reading, told BBC Radio 5 live's Phil Williams people were "threatening or attacking doctors" and "liberating" sick relatives from quarantine units.

He also said people had been seen washing dead bodies that were still "highly infectious".

The virus has killed at least 660 people in West Africa since February.