<sod >Â  Meanwhile, Syrian rebels have started to evacuate three towns in the eastern Qalamoun region in the Damascus countryside, according to Syrian state media.< eod>< sod > Â  TheÂ OPCWÂ has been investigating use of toxic chemicals in Syria's civil war since 2014.Â  Meanwhile, Syrian rebels have started to evacuate three towns in the eastern Qalamoun region in the Damascus countryside, according to Syrian state media.< eod>