trucks. >> someone responded to the site. >> these were first responders. >> something, probably part of the building, crushed it. >> fdny, this truck was the medical examiner who reported immediately after the -- the plane hit the north tower. the towers hadn't collapsed. 8:46 the first plane hit. medical examiner reported this was a truck, setting up a morgue when it was damaged. >> bill is deputy executive director of the port authority of new york and knowledge. their offices used to be locatedded in the twin towers. on the morning. 9/11, 84 of his co-workers died. -- >> september 11th, of course it is personal. there are people think that work with at the port authority who rushed down the stairs to get out of their offices. there are people at the port authority who never came home. there are people, i within to high school with, worked at