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wolmadFDNY, Fire Department, City of New York
-composed of individual Engine, Truck, Ladder, Rescue, HazMat, and EMS companies, as well as other specialized units which handle most of the city's emergencies that could cause dammage to life and property. The FDNY was technically the agency in command of the response at the WTC site.
NYPD - New York City Police Department.
-Provides law enforcement for the NYC. Police Emergency Service Units are also mentioned. These are groups which share some of the responsibilities and training of firefighters, and are familuar with technical rescue equiptment.
PAPDNYNJ - Port Authority Police Department of New York and New Jersey.
-Responsible for providing protection at all of the major ports and entrances to NYC, incluing bus terminals, shipping docks and ports, train stations, rail yards, bridges, tunnels, and other commuter and shipping hubs.