▁not ▁have ▁the ▁necessary ▁technical ▁details ▁to ▁actually ▁manufact ure ▁a ▁bomb . ▁ ▁On ▁ 1 8 ▁December ▁ 2 0 0 3 , ▁Iran ▁volunt arily ▁signed , ▁but ▁did ▁not ▁rat ify ▁or ▁bring ▁into ▁force , ▁an ▁Add itional ▁Pro tocol ▁that ▁allows ▁I AE A ▁inspect ors ▁access ▁to ▁individuals , ▁documentation ▁rel ating ▁to ▁proc ure ment , ▁dual - use ▁equipment , ▁certain ▁military - owned ▁work sh ops , ▁and ▁research ▁and ▁development ▁locations . ▁Iran ▁agreed ▁volunt arily ▁to ▁implement ▁the ▁Add itional ▁Pro tocol ▁provision ally , ▁however ▁when ▁the ▁I AE A ▁reported ▁Iran ' s ▁non - comp liance ▁to ▁the ▁United ▁Nations ▁Security ▁Council ▁on ▁ 4 ▁February ▁ 2 0 0 6 ▁Iran ▁with d rew ▁from ▁its ▁volunt ary ▁ad her ence ▁to ▁the ▁Add itional ▁Pro tocol . ▁ ▁On ▁ 1 2 ▁May ▁ 2 0 0 6 , ▁claims ▁that ▁highly ▁en rich ed ▁u ran ium ▁( well ▁over ▁the ▁ 3 . 5 % ▁en rich ed ▁level ) ▁was ▁reported ▁to ▁have ▁been ▁found ▁" at ▁a ▁site ▁where ▁Iran ▁has ▁denied ▁such ▁sensitive ▁atomic ▁work ", ▁appeared . ▁" They ▁have ▁found ▁particles ▁of ▁highly ▁en rich ed ▁u ran ium ▁[ HE U ], ▁but ▁it ▁is ▁not ▁clear ▁if ▁this ▁is ▁cont am ination ▁from ▁cent rif ug es ▁that ▁had ▁been ▁previously ▁found ▁[ from ▁imported ▁material ] ▁or ▁something ▁new ," ▁said ▁one ▁diplom at ▁close ▁to