BOISE, Idaho (AP) -- Fire crews are working around the clock to contain a southern Idaho wildfire that has burned more than 327,000 acres, or 512 square miles, since Saturday.

Fire officials say the Long Butte Fire is now 10 percent contained. But crews are expected to make gains Tuesday in controlling a blaze burning across rangeland 35 miles south of Glenns Ferry.

Bureau of Land Management Spokeswoman Barbara Bassler says no injuries have been caused by the blaze, but at least 10 ranch buildings have been destroyed.

About 375 firefighters are on scene, with more expected to arrive Tuesday.

The Twin Falls County Commission passed a resolution declaring a disaster area to help farmers suffering crop or livestock losses.

The blaze was ignited by lightning Saturday night and grew quickly during high winds Sunday.

Copyright 2010 The AP.

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