Doctor dies of Ebola after treating patients

"Dr Omar Khan died at 2pm," announced the head of Sierra Leone's health services, Brima Kargbo on Tuesday.

Khan was admitted last week into an anti-Ebola treatment facility run by Médecins Sans Frontières after testing positive for the virus.

He had been in charge of the main Ebola treatment centre in Kenema, around 320km east of the capital Freetown. Three nurses at the facility also died of the disease.

Health minister Miatta Kargbo called Khan a "national hero", praising his "tremendous sacrifice" in working to save the lives of others.

Another doctor, Kent Brantly, remains in a grave condition at an isolation unit on the outskirts of Monrovia, Liberia, after contracting the disease.