Human activity most likely caused Monday's fire, which consumed 128 acres of grassy hiking area in the foothills above Stanford University campus, investigators have concluded.
Investigators found the water generator, which they originally thought caused the fire, was unplugged.
"The area of origin was determined to be near an existing diesel generator. The generator was disconnected and secured at the time of the fire. There was no evidence that arcing or shorting had occurred within any of the electrical equipment in the area, and no fuses had blown,'' according to a statement by Fire Marshal Dan Firth.
Police have evidence the fire was most likely caused by someone and are investigating whether the fire started accidentally or intentionally.
Firefighters and Stanford police will continue to search for clues and interview people regarding the fire's cause. More information will be posted as it becomes available.