A brush and grass fire is burning on Tucson's northeast side near the Redington area.
The "Racetrack Fire" has grown to 750 acres and was reported just before 2 p.m. Sunday according to the U.S. Forest Service.
The fire is 0% contained right now and investigators believe it was human-caused.
Three firefighter crews, three engines, three air tankers and three helicopters are being used to put the fire out.
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