The first line of defense were the airline attendants, then the police, fire department, and port authority. Next came the military. This was a prototype set up and the lighting wasn't too great. This is one that I intend to redo when I have some time.
If you want to read a very touching photobook of 9-11, pick up Dog Heroes of September 11th. They provided a lot of comfort and pick-me-ups for the crews that had to clean up ground zero.