From information in a Los Angeles Times article on September 1, 2002: “It is believed that these men [9/11 hijackers Mohammed Atta, Marwan al-Shehhi, and Ziad Jarrah] and others were recruited [in Hamburg, Germany] into al-Qaeda in a largely informal process that began by drawing them into a deeper commitment to Islam and a more rigid interpretation of it, followed by an invitation to go to Afghanistan to see what it was like, followed by a visit to the terrorist training camps, and ultimately ending in al-Qaeda indoctrination for those who seemed receptive to the idea.”
– Bob Graham with Jeff Nussbaum, Intelligence Matters, Page 133