FILE--This Sept. 11, 2017, file photo shows a man standing at the edge of a waterfall pool at ground zero during a ceremony on the 16th anniversary of the 9/11 attacks in New York. Since September 11, 2001, the neighborhood at the base of the World Trade Center has been transformed by new construction, and washed over by a wave of tourism. But this week's attack has reminded those who live, work, study and visit here of latent fears that this neighborhood would once again find itself in the crosshairs. (AP Photo/Seth Wenig, File)
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