▁against ▁forces ▁loyal ▁to ▁President ▁Bash ar ▁Ass ad ▁in ▁the ▁Sy rian ▁Civil ▁War . ▁He ▁began ▁using ▁the ▁nom ▁de ▁guerre ▁of ▁Ab u ▁Tal ha ▁Al - Al man i ▁( A bu ▁Tal ha ▁the ▁German ). ▁In ▁September ▁ 2 0 1 3 ▁C us pert ▁was ▁reported ly ▁injured ▁in ▁an ▁air ▁strike ▁in ▁Sy ria . ▁Ab u ▁Tal ha ▁continued ▁to ▁post ▁video ▁foot age ▁and ▁messages ▁online ▁in ▁German ▁about ▁his ▁activities , ▁including ▁his ▁advoc acy ▁for ▁active ▁participation ▁in ▁j ih ad ▁and ▁for ▁en act ment ▁of ▁sh aria ▁law . ▁ ▁In ▁November ▁ 2 0 1 3 ▁German ▁authorities ▁issued ▁a ▁warning , ▁em an ating ▁from ▁its ▁Federal ▁C riminal ▁Police ▁Office ▁( B undes k riminal amt ) ▁and ▁made ▁public ▁through ▁the ▁Foreign ▁Office ▁( Aus wär t iges ▁Amt ), ▁about ▁a ▁possible ▁attack ▁by ▁C us pert ▁against ▁German ▁institutions ▁working ▁in ▁Turkey . ▁The ▁warning ▁published ▁by ▁German ▁national ▁daily ▁Die ▁Welt ▁stated ▁that ▁" C us pert ▁could ▁use ▁an ▁explos ive - lad en ▁vehicle ". ▁In ▁a ▁video ▁posted ▁online , ▁Den is ▁C us pert ▁denied ▁the ▁alleg ations , ▁adding ▁that ▁Germany ▁was ▁not ▁his ▁" object ive ▁in ▁terms ▁of ▁attacks ". ▁ ▁Islam ic ▁State ▁By ▁late ▁ 2 0 1 3 , ▁C us pert ▁had ▁left ▁Jun ud ▁al - Sh am ▁and ▁joined ▁the ▁Islam ic ▁State ▁of ▁Ira q ▁and ▁the ▁Lev