Mass. Gen. Laws ch. 164 § 95
Corporations, persons and municipalities engaged in the manufacture, sale, or distribution of gas or electricity shall, within twenty-four hours after every accident caused by gas or electricity manufactured or supplied by them, whereby an employee or other person is injured, rendered insensible, or killed, report in writing to the department, stating the time, place and circumstances of the accident and such other facts relative thereto as the department may require. The chief of police of the town, and the medical examiner of the district, where such accident occurs shall, in writing, report the same to the department. The chief of police shall so report within twenty-four hours, and the medical examiner within seven days, after he has notice thereof. The members of the department shall personally investigate all such cases requiring investigation.
Mass. Gen. Laws ch. 164, § 95