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Two members of the New York City fire department look towards One World Trade Center through an opeining in the ceiling of the Oculus, part of the World Trade Center complex in New York, Tuesday, Sept. 11, 2018, the anniversary of 9/11 terrorist attacks. The transit hall ceiling window was opened just before 10:28 a.m., marking the moment that the North Tower of the World Trade Center collapsed on September 11, 2001. (AP Photo/Craig Ruttle)

FDNY

New York City Fire Department