““responders they came across. Some greatly slowed their own descent in order to assist nonambulatory civilians.186 After 10:28 A.M. The North Tower collapsed at 10:28:25 A.M., killing all civilians alive on upper floors, an undetermined number below, and scores of first responders. The FDNY Chief of Department, the Port Authority Police Department Superin= tendent, and many of their senior staff were killed. Incredibly, twelve firefight= ers, one PAPD””
