The families on Tuesday announced the creation of a Paris-based organization to help document the missing, after a meeting with French diplomats, AP reported.
Khalil al-Haj Saleh, who is leading the group, said the end of fighting and the capture of thousands of Daesh terrorists leaves a small window to find and document what happened to their loved ones, who include Syrian activists and journalists.
The Syrian Network for Human Rights has documented more than 8,000 cases of people missing after being detained by Daesh; hundreds, if not thousands, of bodies have been found in mass graves, but most are unidentified.