After being radicalized in 1999 , Essabar trained in Afghanistan where he learned combat skills and passport alteration . Ramzi bin al-Shibh later said that Essabar delivered the cryptic message from Khalid Sheikh Mohammed , indicating the date that the September 11 attacks would be carried out , although bin al-Shibh 's claim is in doubt . Essabar may not have known the significance of the date , but he did relay the message . The truth of bin al-Shibh 's claims is in doubt , due to " inconsistent statements " . Despite a German arrest warrant issued a month after the attacks , Essabar was not captured and , according to al-Qaeda , was later killed in Afghanistan
September 11 attacks
September 11 attacks
Zakariya Essabar