The wildfire burning in the Rincon Mountains east of Tucson grew Thursday to about 7,500 acres but is 75 percent contained, officials said.

The lightning-sparked Fox Fire began Saturday. Crews have conducted successful burnout operations to deplete natural fuels, according to the Coronado National Forest.

Additional burnouts continued Thursday. Crews also began mop-up operations.

The fire is burning dry grass and brush in steep and rocky terrain in the Rincon Wilderness area.

About 230 people are assigned to the fire. Helicopters and aerial tankers are also being used.

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