Mass. Gen. Laws ch. 48 § 15
The forester, the state fire warden or any duly authorized assistant, the forest warden in a town or the official performing the duties of a forest warden in a city, or any duly appointed deputy forest warden, the director of the division of fisheries and wildlife, an environmental police officer or deputy environmental police officer or a fish and game warden may arrest without warrant any person found in the act of setting, maintaining or increasing a fire in violation of section thirteen. They shall take precautions to prevent the progress of forest fires, or the improper kindling thereof, and upon the discovery of any such fire shall immediately require the necessary assistance in accordance with section ten, the provisions of which and of sections eleven and twelve are hereby made applicable in such case, and shall notify the local forest warden.
Mass. Gen. Laws ch. 48, § 15