▁that ▁he ▁was ▁a ▁great ▁fan ▁of ▁the ▁singer . ▁ ▁Islam ic ▁milit ancy ▁ ▁Den is ▁C us pert ▁became ▁involved ▁with ▁the ▁Egypt ian ▁Aust rian - born ▁al - Q a eda ▁affili ate ▁Moh amed ▁Mah m oud ▁( also ▁known ▁as ▁Ab u ▁Us ama ▁Al - G har ib ), ▁who ▁had ▁founded ▁the ▁Global ▁Islam ic ▁Media ▁Front ▁( G IM F ) ▁as ▁well ▁as ▁the ▁milit ant ▁Sal af ist ▁group ▁Mill atu ▁I bra him , ▁later ▁b anned ▁by ▁the ▁German ▁authorities . ▁ ▁German ▁broad c aster ▁Z DF ▁also ▁received ▁foot age , ▁apparently ▁made ▁by ▁C us pert , ▁in ▁which ▁he ▁threatened ▁to ▁w age ▁J ih ad ▁in ▁Germany ▁and ▁war ned ▁of ▁attacks . ▁According ▁to ▁German ▁security ▁authorities , ▁C us pert ▁managed ▁to ▁leave ▁to ▁Egypt , ▁despite ▁heavy ▁observation , ▁to ▁join ▁the ▁rem n ants ▁of ▁Mill atu ▁I bra him ▁to ▁try ▁to ▁establish ▁a ▁German ▁Sal af ist ▁col ony ▁that ▁sought ▁to ▁imp ose ▁Sh aria ▁law ▁in ▁Germany . ▁According ▁to ▁the ▁Al - Q a ida ▁San ctions ▁Committee , ▁while ▁in ▁Egypt ▁C us pert ▁under w ent ▁fire ar ms ▁training ▁in ▁a ▁milit ant ▁camp , ▁before ▁travel ing ▁to ▁Lib ya ▁for ▁additional ▁training . ▁ ▁Sy ria ▁In ▁August ▁ 2 0 1 3 ▁he ▁appeared ▁in ▁a ▁video ▁fighting ▁alongside ▁the ▁milit ant ▁group ▁Jun ud ▁al - Sh am