Red Bluff firefighters responded to a structure fire early Friday morning. Investigators suspect the fire was human-caused.
The fire was reported at 3:19 a.m. Friday at 237 Main Street.
The initial report indicated a person might have been trapped inside, but no one was found.
The building is a home converted into a business that is currently vacant. Investigators said it appeared squatters had been inside.
The fire was inside the floor, and they extinguished the flames within about 10 minutes.