ARCADIA (CNS) - A small electrical fire on the roof of an Arcadia house  led to the discovery today of an indoor marijuana-growing operation where  thousands of plants were being cultivated and tens of thousands of dollars  worth of electricity had been stolen, police said.

A witness reported the fire in the 2400 block of Louise Avenue about 8:50 a.m., said Arcadia Chief of Police Robert Guthrie.  

Officers and firefighters arrived and found the small fire, which was caused by wires, he said.

“In an attempt to locate persons inside the residence and get them to safety, officers made entry into the house and observed numerous marijuana plants in different stages of cultivation,” Guthrie said, adding that no one  was inside the home.

Once the fire was out, detectives searched the premises and located 2,489 live pot plants along with sophisticated growing equipment, he said.  

“A representative from Southern California Edison was at the location and estimated $16,000 to $20,000 in energy consumption had been stolen during the time of this operation,” Guthrie said.

No one has been taken into custody, but the investigation is ongoing, he said.