Mohamed Atta, Marwan Alshehhi, and an unknown third person are seen in the ground-floor workshops of the architecture department at this time, according to at least two witnesses from the Hamburg university where Atta had studied. They are seen on at least two occasions with a white, three-foot scale model of the Pentagon. Between 60 and 80 slides of the Sears building in Chicago and the WTC are found to be missing from the technical library after 9/11. [Sunday Times (London), 2/3/2002] A Hamburg friend of Atta’s, Margritte Schroeder, will confirm that Atta is in Hamburg around this time, saying later in 2001, “I saw him here in early July and he was as nice as ever.” Other eyewitnesses see Atta and Alshehhi in Hamburg as well. But there is no record of Alshehhi leaving the US around this time, which suggests that he travels on a false passport for this trip. [Miller, Stone, and Mitchell, 2002, pp. 251, 290]