Lowell, MA (May 6, 2026) – A large fire broke out Monday, May 5, at a three-story structure at 865 Bridge St in Lowell, with emergency units arriving to find heavy flames already visible and reports of people trapped inside. The fire was significant enough upon arrival that a second alarm was immediately called.
The blaze spread rapidly beyond the original building, reaching a house directly behind the structure. A third and then a fourth alarm were transmitted as the fire continued to grow. Mutual aid from surrounding communities was requested to help manage the response.
Flames also spread into nearby brush, extending the affected area further. The full scope of injuries or entrapments has not been confirmed at this time.
The cause of the fire remains under review by authorities, and additional details will be shared as they become available. Our thoughts are with all those affected.
How Do Multi-Alarm Fires Work in Massachusetts?
In Massachusetts, alarm levels are used to call in additional firefighting resources as a fire grows beyond what the first-responding units can handle. A first alarm brings the standard initial response, while each additional alarm adds more personnel and equipment to the scene. By the time a fire reaches a fourth alarm, a significant portion of a city’s firefighting capacity — along with mutual aid from nearby towns — is typically deployed.
Three-story structures present a particular challenge because fire can travel quickly through stairwells and wall cavities, reaching upper floors in minutes. When flames spread to neighboring buildings or surrounding brush, crews must manage multiple fronts at once, which stretches resources further and extends the time needed to bring the fire under control.
