The Red Cross is seeking information about three staff members abducted in Syria, five and a half years ago.
In its first detailed statement on the incident, it says Louisa Akavi, Alaa Rajab and Nabil Bakdounes Louisa Akavi, Alaa Rajab And Nabil Bakdounes were seized in October 2013 while travelling to Idlib province in North-Western Syria.
Ms Akavi was held by the Islamic state (IS) group.
Red Cross says there is evidence she was alive in late 2018.
The fate of Mr Rajab and Mr Bakdounes is not known.