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Fire authorities said they believe human activity to be the cause of the Hill Fire, and offered a $10,000 reward for information leading to those who may have been responsible.

CAL FIRE said in a news release Friday that “investigators have been able to rule out all potential causes for the Hill Fire, other than human activity.”

The Hill Fire, which firefighters say is now 100% contained, burned an estimated 4,531 acres.

Investigators are reaching out to anyone who was in the area of Hill Canton Trail on Thursday, Nov. 8, from the hours of 10 a.m. to 3 p.m.

A $10,000 reward is available for information leading investigators to a possible responsible party. Callers can remain anonymous.

Contact Ventura County Crime Stoppers online, or call 1-800-222-TIPS.