SUPERIOR, AZ - A wildfire near Superior has charred about 2,400 acres and still is 40 percent contained.
The fire began Sunday in the Tonto National Forest northwest of Phoenix and is burning in steep, rugged terrain.
Authorities say the cause of the so-called 257 fire is under investigation. The name comes from Forest Road 257, which is where the fire started in a wash.
Nearly 200 firefighters are battling the flames about 4 miles south of Superior. The fire isn't threatening any structures.
Tonto National Forest officials announced Tuesday a temporary closure due to the fire.
The closure begins at the intersection of SR 60/177 junction, northeast along the southern edge of SR 60 to Devil's Canyon, south following Devil's Canyon to the forest boundary, following the forest boundary south and southwest to SR 177, then northerly along the eastern edge of SR 177, north to Hwy. 60.
Officials said the purpose of the closure is to provide for public and firefighter health and safety during the management of the incident.