Poor communication and incompetent staff meant the World Health Organization failed to react swiftly Ebola outbreak in Africa, reports say.
An internal document said those involved "failed to see some fairly plain writing on the wall", according to the Associated Press.
Separately, sources close to the WHO told Bloomberg of multiple failures in the outbreak's early stages.
In response, a senior official told the BBC time would come for an inquiry.
In the worst affected countries - Liberia, Guinea and Sierra Leone - the Ebola virus has now killed 4,546 people with cases of infection numbering 9,191, according to the latest WHO figures