The fire appeared to start in an area toward the rear of the building where large amounts of electrical equipment were housed, said fire Chief Larry Anderson.
There was more smoke than flames, he said, although flames would shoot up and go back down. The fire appeared to spread inside the walls. With power cut to the building, crews were able to conduct an “extension firefight,” which is tracking the flames in the walls and extinguishing them by cutting holes to access them.
Investigators were still trying to determine a source for the fire and an exact starting location.
Source: The Press Democrat