MAHWAH — A 52-year-old man was found unconscious at his residence in Mahwah, amid a fire that broke out in his apartment building.

The resident fell asleep on the couch in his apartment after smoking a cigarette, said arson investigator Sgt. Michael Blondin. Remnants of the cigarette ignited a fire Thursday at 4:11 a.m., which caused the fire alarm to sound off, he said.

Adjacent apartments in the building were evacuated, Blondin said, adding the fire was extinguished by the building's sprinkler system.

The resident was taken to Valley Hospital and treated for minor burns.

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