DANVERS, Mass. (AP) — Authorities in Danvers say a worker has been injured in a small explosion in an outbuilding at the Essex Agricultural & Technical High School.

School Superintendent Dan O'Connell tells WCVB-TV that no students or school staff members were hurt in the Wednesday afternoon incident.

O'Connell said the worker was attempting to install a gas heater when the explosion occurred. He said the worker has second-degree burns on his face, neck and arms that aren't considered life-threatening.

Danvers Fire Lt. Brian Barry tells The Boston Globe it's believed natural gas was the cause of the 2:30 p.m. accident.

Aerial footage showed debris behind a detached shed-like building.