NASHUA, NH — Police and firefighters responded to a building near a New Hampshire mental health facility on Monday afternoon for a large fire after a reported explosion.
Video from the scene showed firefighters dousing one of the wooden buildings on the Greater Nashua Mental Health Center campus with water as the top floor burned.
Merrimack Fire and Rescue says the building is near the old Building 10 property.
Part of the roof can even be seen crumbling away.
Police also asked residents and drivers to avoid the area around Amherst Street.
Active incident involving gas leak in the area of 440 Amherst Street. Avoid the area and seek an alternate route.
— Nashua Police (@NashuaPolice) February 2, 2026
The gas company for the property, Liberty of New Hampshirem said crews are onsite and assessing the fire.
“Until further information is known, avoid the area and please follow all safety precautions as directed by Nashua fire department and other public officials,” Liberty wrote on Facebook.
The New Hampshire State Fire Marshal’s office is also assisting with the response.
Investigators with @NH_FMO are responding to a reported explosion that resulted in a building fire in Nashua. Please avoid the area. Updates to follow. #NHSFMO pic.twitter.com/TuxLq2itNg
— NH State Fire Marshal’s Office (NHSFMO) (@nhfmo) February 2, 2026
This is a developing story. Check back for updates as more information becomes available.
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