The Hamburg cell (German: Hamburger Terrorzelle) was, according to U.S. and German intelligence agencies, a group of radical Islamists that included students who eventually came to be key operatives in the 9/11 attacks. Important members included Mohamed Atta, who led the four hijacking teams in 2001 and piloted American Airlines Flight 11; Ramzi Binalshibh, who conspired with the other three members but was unable to enter the United States; and Marwan al-Shehhi, who piloted United Airlines Flight 175. Less important members included Said Bahaji, Zakariya Essabar, Mounir el Motassadeq, and Abdelghani Mzoudi. Ziad Jarrah, who piloted United Airlines Flight 93, and failed to hit a unknown target in Washington D.C. is also sometimes listed in the Hamburg cell.
http://en.wikipedia.org/wiki/Hamburg_cell 
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