Sheriff Larry Blanton told those at Monday night's public information meeting at Bend High, it was human caused.
"We're working two points of origin, but it was human caused. It's too early to say, but we've got resources on it and we'll figure it out. We'll probably be requesting help on our tip line and we will track it down as fast as we can."
The Sheriff's Office, Oregon State Police and the U.S.Forest Service are investigating the cause of the Bend area fire.
Anyone with information is asked to call Crime Stoppers at 1-877-876-TIPS.