Mohamed Atta
Mohamed Atta, Ramzi bin al-Shibh, Marwan al-Shehhi and Ziad Jarrah came into the picture in 1999, when they arrived in Kandahar from Germany. The Hamburg cell was formed in 1998 shortly after Atta received Al-Qaeda leadership approval for his plot. Mohamed Atta, Marwan al-Shehhi, Ziad Jarrah, Ramzi bin al-Shibh, Said Bahaji, Zakariyah Essabar, and fifteen others were all members.