The fire started Wednesday afternoon just after 1:30 off Pomona Avenue in Chico.
Neighbors we spoke with said they heard several explosions when the fire started. Investigators say that's because the cause of this fire was a butane honey oil lab explosion, which is the process of taking THC off the marijuana.
A man in his thirties was burned and remains in serious condition Thursday night. Investigators say that if he survives his injuries, he will face multiple felonies for manufacturing a controlled substance, and will also be charged for starting a fire in an uninhabited dwelling.