In this Sept. 11, 2001, file photo, smoke billows from World Trade Center Tower 1 and flames explode from Tower 2 as it is struck by United Airlines Flight 175, in New York. (AP Photo/Chao Soi Cheong, File)
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In this Sept. 11, 2001, file photo, smoke billows from World Trade Center Tower 1 and flames explode from Tower 2 as it is struck by United Airlines Flight 175, in New York. (AP Photo/Chao Soi Cheong, File)
