Arson has been deemed the cause of a wildfire last month in and surrounding the town of Paradise. The fire leveled more than 80 homes.
According to a report from the California Department of Forestry and Fire Protection, investigators have ruled out other possible causes for the blaze.
Last month's fire scorched more than 23,500 acres after it began on June 11.
A $10,000 reward is being offered for information leading to an arrest and conviction.