The Brief An 18-month investigation by LA County Fire arson investigators determined electrical arcing on an out-of-service Southern California Edison tower caused the Eaton Fire. Investigators identified the fire's point of origin as dry brush directly beneath SCE transmission towers near Eaton Wash. On Tuesday, investigators with the Los Angeles County Fire Department released their findings into the cause of the deadly Eaton Fire. "The investigation concluded that the cause of the wildfire conflagration was due to the electrical arcing events that took place on the out-of-service Southern California Edison (SCE) tower," officials wrote in the report. The other side:SCE previously said LA County agencies failed to send timely evacuation warnings to Altadena residents.