ant ▁( IS IL ). ▁He ▁reported ly ▁took ▁part ▁in ▁the ▁First ▁Battle ▁of ▁the ▁Sh a er ▁gas ▁field ▁in ▁July ▁ 2 0 1 4 ▁with ▁I SI L ▁forces ▁against ▁the ▁Sy rian ▁Ar med ▁Forces . ▁ ▁In ▁the ▁summer ▁of ▁ 2 0 1 4 , ▁Daniel a ▁Gre ene , ▁an ▁F BI ▁transl ator ▁who ▁had ▁been ▁investig ating ▁C us pert , ▁tra ve led ▁to ▁Sy ria ▁in ▁order ▁to ▁marry ▁C us pert . ▁This ▁occurred ▁without ▁knowledge ▁or ▁authorization ▁of ▁her ▁super iors . ▁She ▁returned ▁to ▁the ▁U . S . ▁a ▁few ▁months ▁later , ▁conf essed , ▁and ▁co oper ated ▁with ▁authorities , ▁in ▁return ▁for ▁a ▁light ▁two - year ▁prison ▁sentence . ▁ ▁In ▁November ▁ 2 0 1 4 , ▁a ▁video ▁was ▁released ▁by ▁the ▁activ ist ▁group ▁" De ir ▁E zz ore ▁Is ▁Being ▁S la ugh tered ▁Sil ently ”, ▁which ▁showed ▁I SI L ▁members ▁shooting ▁and ▁be head ing ▁a ▁number ▁of ▁un ar med ▁men , ▁and ▁C us pert ▁holding ▁a ▁sever ed ▁head . ▁The ▁video ▁was ▁believed ▁to ▁be ▁from ▁an ▁August ▁ 2 0 1 4 ▁mass acre ▁against ▁prisoners ▁from ▁the ▁Sun ni ▁Arab ▁Al - Sh ait at ▁tribe ▁who ▁had ▁fought ▁against ▁I SI L . ▁ ▁Re ports ▁of ▁death ▁In ▁April ▁ 2 0 1 4 , ▁a ▁number ▁of ▁international ▁media ▁out lets ▁ran ▁err one ous