Miranda Warning System: CHELMSFORD — Local and state officials are investigating an early-morning fire that claimed two people’s lives on Saturday, October 4, 2025, said Chelmsford Fire Chief Gary Ryan, Chelmsford Police Chief Colin Spence, State Fire Marshal Jon M. Davine, and Middlesex County District Attorney Marian T. Ryan. “This is a very sad day for our community and especially for the two families who lost loved ones,” said Chief Ryan. “On behalf of the Chelmsford Fire Department, I want to extend our heartfelt condolences.” A neighbor reported the fire at 53 Mobile Avenue just after 4:40 a.m. on Saturday. A Chelmsford Fire Department engine company was close by on an unrelated call and arrived on scene moments later to find smoke and flames at the front and rear of the building. A ladder company arrived a short time later. Firefighters immediately made entry to locate occupants and attack the fire. They removed two men, both in their 50s, who were pronounced deceased at the scene. The Office of the Chief Medical Examiner will determine the cause and manner of their deaths. Firefighters brought the fire under control in about half an hour, with no extension to surrounding properties. The origin and cause of the fire are under investigation by the Chelmsford Fire Department, Chelmsford Police Department, State Police fire investigators assigned to the State Fire Marshal’s Office, and State Police assigned to the Middlesex District Attorney’s Office. They are supported by the Department of Fire Services’ Code Compliance & Enforcement Unit. Preliminarily, the fire does not appear suspicious. “Investigators found no working smoke alarms at the scene,” said State Fire Marshal Davine. “We can’t stress enough how important smoke alarms are to surviving a fire at home—especially when we’re sleeping. Please take a few minutes today to be sure you and your loved ones are protected.” Any questions regarding the investigation should be directed to the Massachusetts State Fire Marshal’s Office.