No arrests have been made and the investigation to identify who is responsible continues.
The fire began on June 18 and grew to over 1,400 acres over three days. 300 residents were evacuated after areas were threatened by the fire, which burned five buildings. No injuries were reported.
"We believe the fire was started near the livestock corrals in the northwest part of the town. At this point, we have ruled out accidental causes for the Kearny River fire and are now looking at who was seen in the area when the fire started," stated PCSO Sheriff Paul Babeu.
If you have any information about the suspicious origin of the fire, call PCSO at (520) 866-5111.
This is a developing story. Stay with FOX 10 News for updates.