The head of the UN Ebola response mission in West Africa has told the BBC there is still a "huge risk" the deadly disease could spread to other parts of the world. Tony Banbury declined to say if targets he had set in the fight against Ebola, to be achieved by Monday, had been met.

The Obama administration has asked Congress for more than $6 billion in emergency funding to fight the Ebola epidemic in West Africa and secure the United States against further spread of the deadly virus.