, ▁in ▁his ▁appearance ▁before ▁the ▁parliament ary ▁committee ▁of ▁inqu iry , ▁Juan ▁Jesus ▁S ánchez ▁Man z ano ▁( the ▁head ▁of ▁the ▁T ED AX ) ▁stated ▁that ▁traces ▁of ▁nit rog ly cer ine ▁had ▁been ▁detected ▁in ▁the ▁samples ▁recovered ▁after ▁the ▁bomb ings . ▁He ▁would ▁later ▁ret ract ▁this ▁statement ▁before ▁the ▁investig ating ▁magistr ate ▁in ▁charge ▁of ▁the ▁case ▁and ▁emphas ised ▁that ▁he ▁was ▁not ▁an ▁expert ▁in ▁explos ives . ▁The ▁statement ▁by ▁S ánchez ▁Man z ano ▁led ▁supp or ters ▁of ▁the ▁idea ▁that ▁E TA ▁was ▁involved ▁in ▁the ▁bomb ings ▁to ▁question ▁whether ▁the ▁explos ive ▁used ▁in ▁the ▁bomb s ▁had ▁been ▁G oma ▁ 2 ▁E CO . ▁N it rog ly cer ine ▁is ▁not ▁a ▁component ▁of ▁G oma ▁ 2 ▁E CO . ▁ ▁In ▁the ▁run ▁up ▁to ▁the ▁trial ▁of ▁those ▁accused , ▁the ▁court ▁ordered ▁that ▁fresh ▁tests ▁be ▁carried ▁out ▁on ▁the ▁samples ▁recovered ▁from ▁the ▁trains ▁and ▁on ▁remains ▁of ▁explos ive ▁recovered ▁from ▁different ▁sites ▁connected ▁to ▁the ▁bomb ings . ▁These ▁tests ▁were ▁carried ▁out ▁by ▁special ists ▁appointed ▁from ▁the ▁security ▁services , ▁the ▁defence ▁and ▁other ▁parties ▁to ▁the ▁accus ation . ▁The ▁jud ges ▁ordered ▁that ▁video ▁and ▁audio ▁record ings ▁be ▁made ▁of ▁these ▁tests . ▁The ▁results ▁of ▁these ▁tests ▁were ▁also ▁incon clus ive ▁concerning ▁the ▁samples ▁taken ▁from ▁the ▁explos ion ▁sites . ▁N it rog ly cer ine