Two weeks after the 2005 London bombings, a new directive stated that New York City would institute a citywide transit Auxiliary program with the intent of reducing crime and fighting terrorism in the city's transit system. Transit Auxiliary officers work out of Transit Bureau precincts known as Districts and carry Transit portable radios. Unlike a precinct, the transit districts cover miles of underground subway. Transit Auxiliary Police officers go through additional training by the Transit Bureau Vandals Squad as well as the Counter-Terrorism Division to build vandalism and terrorism awareness within the Transit System. Transit Auxiliary officers are paired with either a regular police officer or Auxiliary police officer. Transit Auxiliary Police periodically perform inspections of the subway station(s) and platforms which they are assigned to, taking note of any suspicious occurrences, and set up a fixed post at the subway turnstiles, token booths, mezzanines, or platforms. Transit Auxiliary officers also conduct subway train inspections as well as train runs to/from stations that which assignment is given. Due to the common medical emergency calls in Transit, if medically qualified, Transit Auxiliary Police officers can respond to medical emergencies if they are near to the transit location. The main function of the NYPD Transit Auxiliary Police, like the NYPD Transit Police, is to primarily remain within the subway system.