Authorities said multiple workers were injured after a powerful blast triggered a large industrial fire at a lumber facility.
JAY, Maine — A powerful explosion followed by a massive fire ripped through a lumber mill in western Maine on Thursday, injuring multiple people and prompting officials to declare a mass casualty event as emergency crews battled flames and searched the industrial site.
Emergency responders rushed to the facility after reports of a large blast shook nearby neighborhoods and sent thick black smoke rising above the mill complex. Authorities said several workers suffered injuries ranging from burns to trauma-related wounds, though officials had not confirmed an exact number of victims Friday morning. Firefighters, paramedics and law enforcement agencies from multiple communities responded to the scene as crews evacuated portions of the area surrounding the facility. Officials said some injured workers were treated at nearby hospitals while others were airlifted for specialized medical care because of the severity of their injuries.
Witnesses described hearing a thunderous explosion shortly before flames erupted across sections of the lumber mill. Residents several miles away reported feeling windows shake as smoke spread across the sky above Jay, a town long tied to Maine’s forestry and paper industries. Firefighters arriving at the scene encountered intense flames, damaged industrial equipment and debris scattered across parts of the property. Authorities said crews worked through the night to contain the blaze while preventing the fire from spreading to nearby structures and fuel storage areas. Officials also established a command center near the mill as investigators and hazardous materials teams entered the scene. Emergency personnel said conditions remained dangerous for hours because of unstable structures, heavy smoke and concerns about additional explosions.
Authorities said the explosion occurred inside or near a production area connected to lumber processing operations, though investigators had not publicly identified the exact source Friday. Industrial safety specialists and state fire investigators began examining whether mechanical failure, combustible dust, chemical materials or equipment malfunction may have contributed to the blast. Experts noted that lumber and wood-processing facilities can face elevated fire risks because fine wood dust particles may ignite rapidly under certain conditions. Officials stressed that investigators had not determined a definitive cause and said the inquiry could take days or weeks depending on the extent of structural damage and evidence recovery efforts. Law enforcement officers also restricted access to surrounding roads while investigators documented debris fields and inspected damaged sections of the facility.
The explosion drew a large emergency response from across central and western Maine, with ambulances, fire engines and rescue teams arriving from neighboring counties throughout the night. Hospitals in the region activated emergency protocols to prepare for incoming patients while local officials monitored air quality and public safety conditions near the fire. Authorities said several workers were accounted for after evacuations, though emergency crews initially faced uncertainty about how many employees may have been inside affected sections of the facility at the time of the explosion. Officials later said search operations continued after the fire was brought under partial control. State emergency management agencies coordinated with federal occupational safety authorities expected to assist in the investigation.
The lumber mill plays a major role in the local economy, employing workers from Jay and nearby communities connected to Maine’s longstanding forest products industry. Residents described the facility as one of the area’s largest employers, with many families depending on mill operations for jobs and transportation contracts. Community members gathered outside emergency staging areas Friday morning awaiting updates about injured workers and possible missing employees. Local officials said the disaster deeply affected residents because many workers at the facility are longtime neighbors, relatives and friends. Maine Gov. Janet Mills said state resources were being directed to support local responders and hospitals handling the emergency.
Witnesses near the scene described seeing towering flames and heavy smoke pouring from the industrial site moments after the explosion. Some residents said they initially believed an earthquake or major vehicle crash had occurred because of the force of the blast. Emergency sirens echoed through the town for hours as firefighters rotated through intense heat and smoke conditions overnight. Workers who escaped the mill described confusion and panic as alarms sounded and employees rushed away from damaged buildings. Several families gathered at temporary reunification sites established by emergency officials while authorities worked to identify injured workers and contact relatives.
The investigation remained active Friday as firefighters continued extinguishing hot spots and industrial safety officials searched for evidence inside the damaged facility. Authorities said additional updates about injuries, missing workers and the possible cause of the explosion are expected after investigators complete structural assessments and employee accountability checks.
Author note: Last updated May 15, 2026.