The Etiwanda fire that burned 2,143 acres near Rancho Cucamonga and forced the evacuation of nearly 1,700 homes was started by an illegal campfire, the U.S. Forest Service announced Monday.
Investigators hiked into the remote upper portion of Day Canyon once conditions allowed and discovered evidence of the campfire, according to a news release from the Forest Service.
It appeared the campfire may have been smoldering for several days before strong winds the area experienced last week blew embers into nearby brush, the release stated.
The fire was 96 percent contained as of Monday evening, according to the Forest Service.
Officials were asking that anyone who observed hikers, or other individuals, in the area during the week leading up to the fire to call the WeTip Hotline at 800-472-7766 or submit the tip on-line at http://wetip.com/submit-anonymous-tip-2/.