Crews putting out a house fire in the 4200 block of Darwin Way discovered a large marijuana operation inside the home San Diego police confirmed.
The house has nothing in it and was being used solely for growing pot. About 100 plants were found in just one back bedroom.
The call originally came in as a house fire, but after crews forced entry into the home they found plants of different strains and stages of growth in all five rooms of the house.
The operation is elaborate and sophisticated according to San Diego Fire.
SDPD is handling the investigation for now, but the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) will likely join them at some point.
Arson investigators were initially called out, but the fire was determined to be an electrical problem.