SIERRA VISTA, Ariz. -- More firefighters are battling a blaze burning in the Huachuca Mountains in southeastern Arizona.
Crews also say low fire behavior Thursday allowed them to strengthen fire lines.
Fire managers say aerial mapping now puts the Brown Fire at 240 acres, down from the previous estimate of 366 acres. There's still zero containment.
More than 400 people are now assigned to the fire, including 10 ground crews, several engines and numerous helicopters. Air tankers also are available.
Fire managers say no structures are currently threatened but residents of canyon areas have been told to be ready to evacuate.
The fire started April 13 and is burning in brush and timber in steep and rugged terrain in the Coronado National Forest.
The fire is approximately five miles southwest of Sierra Vista.
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