A plane carrying one of two US aid workers infected with the deadly Ebola virus has left Liberia for the United States, a spokesperson for the charity Samaritan's Purse said.
The plane was carrying Dr. Kent Brantly. The second Samaritan's Purse staff member, missionary Nancy Writebol, is due to be transported on a later flight, as the plane is only equipped to carry one patient at a time.
The charity said on Friday the medical evacuations should be completed by early next week.
More than 160 staff will work in a UK-funded facility in Sierra Leone which is due to open in October.
UK trials of a vaccine for the Ebola virus began today - but some experts complain that the response has been a long time coming.
A Swansea doctor who took leave to treat Ebola patients in Africa, is back on the wards after three weeks in isolation.