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REVERE, Mass. (AP) — Authorities say a boiler explosion in the basement of a suburban Boston home has killed a man.

The Massachusetts fire marshal’s office says the victim had gone to check on the boiler in the Revere home at about 4:30 a.m. Wednesday when it exploded.

The blast blew out the basement windows.

The man’s brother tells WBZ-AM that the home’s heating system had been malfunctioning for several days and the victim was trying to fix it. Officials have not released the man’s name.

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Fire officials say the explosion was caused by over-pressurization. Nine other people escaped unharmed but have been displaced from the building.