A brush fire that started Friday along the U.S.-Mexico border has grown to more than 500 acres.
The W-2 fire is burning seven miles west of Lochiel, east of Nogales and about 70 miles south of Tucson, in oak grassland and brush, said a news release from the U.S. Forest Service.
A rancher reported seeing smoke in the area around 3 p.m. Friday. The exact origin of the fire has not yet been determined, but it is likely human caused, the release said.
Six hand crews, two helicopters, two engines, two single-engine air tankers, a heavy air tanker and 160 firefighters were battling the fire, which grew to 530 acres Saturday, the release said.
Crews planned to construct additional fire lines and conduct burnouts in the area Sunday.
No homes or buildings are being threatened by the fire, the release said.
Fire restrictions in place on public and state trust lands ban the use of any flammable devices, smoking or open fires or target shooting. Fireworks are always banned on state lands.