A gas leak explosion at the Greater Nashua Mental Health Center on Amherst Street in Nashua, New Hampshire, has injured three firefighters, prompted large-scale evacuations, and destroyed the building, officials said. Fire crews responded after residents reported a strong smell of gas; the explosion occurred while first responders were investigating, triggering a four-alarm fire that sent smoke and flames into the sky. All people inside were eventually accounted for, though firefighters were rushed to hospitals with non-life-threatening injuries. Why this matters now: this incident highlights ongoing safety risks from aging gas infrastructure and emergency response challenges in cold weather conditions.
Massive Emergency Response to Gas Leak and Blaze
Shortly after a 911 call reported a gas odor around 2:15 p.m. EST, Nashua fire and rescue teams arrived at 440 Amherst St., home to the Greater Nashua Mental Health building. Officials quickly identified a dangerous gas leak and began evacuating the structure. Moments later, an explosion rocked the building as crews prepared to enter, forcing firefighters to retreat moments later as the structure began collapsing.
City fire command issued a multi-alarm response, bringing in additional units from Merrimack, Hollis, Hudson, and neighboring communities. Water supply issues due to freezing temperatures complicated efforts, requiring extended hose lines and extra resources to battle the spreading blaze. Nearby residents were alerted to shelter in place or leave the area and to extinguish open flames to avoid accidental ignition.
Who Was Affected by the Explosion and fire?
At the time of the incident, around 40 people were inside the mental health facility for appointments or staff activities. Emergency personnel confirmed all occupants were safely evacuated and accounted for as firefighting continued.
Three Nashua firefighters suffered injuries—one more serious than the others—and were transported to local hospitals. Two remained overnight for observation with non-life-threatening conditions, while one was treated and released.
Officials initially feared four people might be unaccounted for, but fire leadership later clarified all had been located and were safe after evacuation and tracking efforts.
Investigation into Cause and Structural Damage
Fire officials confirmed the explosion originated from a natural gas leak inside the facility, though the exact source point is still under review. New Hampshire Fire Marshal teams joined local investigators to interview witnesses and examine evidence. Once the fire is fully extinguished, investigators will conduct a methodical examination of the gas system, building infrastructure, and utility records to determine where and why the leak began.
The building has been ruled a total loss by emergency crews, with portions of the roof and structural supports collapsed into charred rubble. Officials have shifted to defensive firefighting tactics due to structural instability, and discussions about controlled demolition are ongoing.
Impact on Residents and Local Infrastructure
Amherst Street and surrounding routes were closed for much of Monday evening as emergency operations were underway. Nearby utility company crews cut power to approximately a dozen customers in the area as a safety precaution, and restoration will only occur once authorities deem it safe.
Local airports and businesses reported minimal disruption beyond the road closures, but residents within a half-mile said they felt the explosion shake homes and heard a loud “boom” echoing through the neighborhood.
Authorities advised shelter-in-place protocols for nearby homes and businesses during the height of the emergency. They also urged people to drop open flames and avoid driving through the scene due to emergency vehicles and hoses.
Why This Incident Matters Now
This explosion serves as a stark reminder of the risks associated with natural gas infrastructure, especially in densely populated urban or commercial zones. Aging pipelines and delayed reporting of gas odors can escalate into life-threatening events, underscoring the need for improved safety audits and rapid utility responses. Emergency planners also highlight the challenges cold weather poses for firefighting, including frozen hydrants and hose accessibility.
Local and state officials, including New Hampshire Governor Kelly Ayotte, praised the quick work of first responders, noting their interventions likely prevented further injury or loss of life. The governor’s statement reaffirmed support for the injured and acknowledged the collaborative work between local fire departments and utility teams.
Community Response and Next Steps
Community leaders have set up support networks for displaced facility staff and clients, with alternative mental health service operations temporarily shifted to other nearby locations. Emergency management officials continue to monitor the scene and provide updates as the investigation progresses.
Residents are urged to follow official guidance from Nashua Fire Rescue and municipal authorities, and to report any unusual gas smells immediately to utility services.
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