A brush fire has burned 600 acres in the Tonto National Forest near Bush Highway and State Route 87 as of Saturday evening, according to the Tonto National Forest.

Officials said the fire, named the Bush Fire, is burning north to Sugarloaf Recreation area and has jumped over the highway and is burning east along Four Peaks Road. The fire started at 2 p.m. on Saturday.

SR-87 northbound is closed at Bush Highway, and southbound is closed at SR-188, according to Arizona Department of Transportation. The detour is US-60/SR-188 through Globe. There is no estimated time when the highway will be reopened.

No containment has been identified of the human-caused fire.

The human-caused Bush Fire started Saturday and spread quickly amid hot, dry and windy conditions. By Monday afternoon, officials said the Bush Fire had burned 37,900 acres in the Tonto National Forest with no containment.

The Bush Fire was concentrated in the Four Peaks Wilderness area of the national forest.

The fire has forced closures on State Route 87 between Bush Highway and Payson. State Route 188 was also closed between Globe and SR 87. The Arizona Department of Transportation has advised drivers to detour around the fire on State Route 260 to Interstate 17.