1 ▁in ▁the ▁United ▁States . ▁ ▁In ▁the ▁mid - 1 9 9 0 s , ▁bin ▁al - Sh ib h ▁moved ▁as ▁a ▁student ▁to ▁Hamburg , ▁Germany , ▁where ▁he ▁alleg edly ▁became ▁close ▁friends ▁with ▁Moh amed ▁Att a , ▁Z i ad ▁Jar rah ▁and ▁Mar wan ▁al - She h hi . ▁T ogether , ▁they ▁are ▁sus pected ▁of ▁forming ▁the ▁Hamburg ▁cell ▁and ▁becoming ▁central ▁perpet rat ors ▁of ▁the ▁September ▁ 1 1 ▁attacks . ▁He ▁was ▁the ▁only ▁one ▁of ▁the ▁four ▁who ▁failed ▁to ▁obtain ▁a ▁U . S . ▁vis a ; ▁he ▁is ▁accused ▁of ▁acting ▁as ▁an ▁inter medi ary ▁for ▁the ▁hij ack ers ▁in ▁the ▁United ▁States , ▁by ▁w iring ▁money ▁and ▁passing ▁on ▁information ▁from ▁key ▁al - Q a eda ▁figures . ▁After ▁the ▁attacks , ▁bin ▁al - Sh ib h ▁was ▁the ▁first ▁to ▁be ▁public ly ▁identified ▁by ▁the ▁U . S . ▁as ▁the ▁" 2 0 th ▁hij acker ", ▁of ▁whom ▁there ▁have ▁been ▁several ▁more ▁possible ▁candidates . ▁ ▁Bin ▁al - Sh ib h ▁has ▁been ▁in ▁United ▁States ▁cust ody ▁since ▁he ▁was ▁captured ▁on ▁September ▁ 1 1 , ▁ 2 0 0 2 , ▁in ▁Kar achi , ▁Pakistan . ▁He ▁was ▁held ▁by ▁the ▁C IA ▁in ▁black ▁sites ▁in ▁Mor oc co ▁before ▁being ▁transferred ▁to ▁Gu ant an amo ▁Bay ▁in ▁September ▁ 2 0 0 6 . ▁Finally