N.J. Stat. § 40A:14-54: Firemen in the performance of their duties to have powers of police officers

The members and officers of the paid or part-paid fire department and force of a municipality shall have the powers and authority of police officers within the municipality, to be exercised while going to, attending and returning from a fire.

L.1971, c. 197, s. 1, eff. July 1, 1971.