The cause of the blaze that began May 13 was under investigation, but had burned grass, shrubs and timber at a rapid pace.

Fire personnel in eastern Arizona have spent the last week working to get control of the Greer Fire, which has burned over 20,000 acres since May 13.

Firefighters took advantage of good weather to activate significant air support on May 15 but were bracing for winds to pick up over the weekend.