N.J. Stat. § 40A:14-54.1
The chief or other superior officer of any municipal paid or part-paid fire department or volunteer fire company, or a State fire warden, who is charged with the duty of supervising or directing operations at the scene of any fire shall be the sole authority within fire lines established by said fire chief or other superior fire officer, or State fire warden, at the scene of such fire with respect to all firefighting operations relating to the protection of lives and property endangered by such fire, and within said fire lines such authority shall supersede that of any municipal police authority. The authority hereby invested in the chief or other superior officer, or State fire warden, shall terminate at such time as he shall declare the fire out. Nothing in this act shall affect the powers possessed by the Governor under the various emergency acts nor the powers possessed by any State agency to protect the public health, welfare and safety.
N.J.S. § 40A:14-54.1