A wildfire burns in the Santa Catalina Mountains in Coronado National Forest northeast of Tucson, Ariz., as emergency vehicles sprint up the Catalina Highway on Sunday (Oct. 27).

A 200- to 250-acre wildfire in Arizona’s Coronado National Forest prompted the evacuation of the Molino Basin Campground Sunday (Oct. 27) afternoon, officials told tucson.com.

The Molino Fire was reported around 3:30 p.m. and continued to spread Sunday night, fueled by grass and mesquite brush. It was 0% contained as of 9 p.m., said Brandalyn Vonk, spokeswoman for the Molino Fire.

Coronado National Forest officials, with the help of local fire departments and the National Park Service, are working along Mount Lemmon Highway, protecting ensuring the fire does not reach the road or threaten any structures, Vonk said. The fire was not threatening any structures as of 10 p.m. Sunday.

Because the fire is in deep, rugged terrain, firefighters are staged in the campground and along the road. The terrain and low visibility once it got dark kept firefighters from being able to get closer to the fire, Vonk said, adding that the safety of firefighters is their top priority.

“The fire will continue to spread naturally until we can get to an area where we can put our firefighters in there safely,” she said.

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