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Scott G Winterton, Deseret News
Fire crews drive to their work area on scene of the White Rock fire Monday, June 4, 2012. A P2V heavy air tanker crashed, killing both Boise crew members Todd Tompkins, 48, and Ronnie Chambless, 40.

CALIENTE, Nev. — Fire officials say a wildfire burning on the Nevada-Utah border is now 40 percent contained, even though the blaze grew amid high winds Tuesday.

Bureau of Land Management spokeswoman Kirsten Cannon says the White Rock Fire is about 6,900 acres Wednesday morning.

Winds of about 30 mph Tuesday grew the fire in the northeast corner in Utah.

Crews don't expect to fully contain the fire until Sunday evening. Nearly 350 people, including support staff, are working on the blaze.

Authorities say the wildfire was sparked Friday night by lightning on the eastern edge of Nevada's Lincoln County. It's burning in steep, rugged terrain and has spread into Utah.

Two pilots from Boise, Idaho, were killed Sunday when their firefighting aircraft crashed during a mission to drop retardant on the blaze.