In fact, the 9/11 Commission notes UAE involvement in Islamist terrorism in several spots:
Page 138: "Even after Bin Ladin’s departure from the area, CIA officers hoped he might return, seeing the camp as a magnet that could draw him for as long as it was still set up.The military maintained readiness for another strike opportunity.160 On March 7, 1999, [Richard] Clarke called a UAE official to express his concerns about possible associations between Emirati officials and Bin Ladin.Clarke later wrote in a memorandum of this conversation that the call had been approved at an interagency meeting and cleared with the CIA." [This involved Clarke blowing a cover on a covert operation.]
Page 167: "In early 2000,Atta, Jarrah, and Binalshibh returned to Hamburg. Jarrah arrived first, on January 31, 2000.97 According to Binalshibh, he and Atta left Kandahar together and proceeded first to Karachi, where they met KSM and were instructed by him on security and on living in the United States. Shehhi apparently had already met with KSM before returning to the UAE.Atta returned to Hamburg in late February, and Binalshibh arrived shortly thereafter. Shehhi’s travels took him to the UAE (where he acquired a new passport and a U.S. visa), Saudi Arabia, Bahrain, and one or more other destinations."
Page 171: "Bin Ladin relied on the established hawala networks operating in Pakistan, in Dubai, and throughout the Middle East to transfer funds efficiently."
Page 216: "On June 20, Hanjour returned home to Saudi Arabia. He obtained a U.S. student visa on September 25 and told his family he was returning to his job in the UAE. Hanjour did go to the UAE, but to meet facilitator Ali Abdul
Aziz Ali.62"
Page 224: "The Hamburg operatives paid for their flight training primarily with funds wired from Dubai by KSM’s nephew,Ali Abdul Aziz Ali. Between June 29 and September 17, 2000,Ali sent Shehhi and Atta a total of $114,500 in five transfers ranging from $5,000 to $70,000."
Page 236: "After training in Afghanistan, the operatives went to a safehouse maintained by KSM in Karachi and stayed there temporarily before being deployed to the United States via the UAE. ... Ali apparently assisted nine
future hijackers between April and June 2001 as they came through Dubai. He helped them with plane tickets, traveler’s checks, and hotel reservations; he also taught them about everyday aspects of life in the West, such as purchasing clothes and ordering food. Dubai, a modern city with easy access to a major airport, travel agencies, hotels, and Western commercial establishments,was an ideal transit point."
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As cited by captainsquartersblog
(http://www.captainsquartersblog.com/mt/archives/006359.php)