2006 New York Code - Fire Lines.

 
    § 15-207 Fire lines. During the actual prevalence of any fire or other
  emergency, the officers of the police and fire departments shall remove,
  or  cause  to be removed and kept away from the vicinity of such fire or
  other emergency, all idle and suspicious persons, and all persons  unfit
  to  be  employed,  or  not actually and usefully employed, in aiding the
  extinguishment and termination of such fire or other emergency or in the
  preservation of property in the vicinity thereof.