A 2,000-acre brush fire was burning Wednesday north of Sonoita, and winds may hamper firefighters’ efforts Thursday.

The fire forced the closure of Arizona 83.

The Oak Tree fire was burning grass and brush near milepost 42, about 10 miles north of Sonoita. The blaze was 20 percent contained Wednesday night, fire officials said.

The highway was closed between Sahuarita Road and the Arizona 82 and 83 junction, Arizona Department of Public Safety officials said, adding that one lane may be open by Thursday morning.

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It was determined that the fire was human-caused, and it was reported at 1:15 p.m., said Michelle Fidler, a National Park Service spokeswoman.

The closest structure was about five miles away, Fidler said.

There were 100 firefighters assigned to the blaze along with four water tenders. Seven air crews worked the fire until nightfall, Fidler said.