PLACENTIA, Calif. (AP) — Southern California authorities say workers trying to restore power after an electrical fire discovered an illegal marijuana growing operation with more than 3,000 plants.

Firefighters were dispatched Sunday in Placentia after several people called 911 reporting a wooden electrical pole was on fire and power lines were down in the street.

The flames were quickly extinguished. The Orange County Register reports utility workers were able to trace the cause of the fire to a power surge from a closed business that had a strong smell of marijuana coming from it.

Detectives found the illegal operation after obtaining a search warrant. Officials say the plants are estimated to be worth several million dollars.

No arrests were immediately announced. Investigators are trying to determine who owns the business.