A federal official says crews think it'll take several days to contain a wildfire that has grown to almost 4.7 square miles in remote northeast Nevada rangeland near a stretch of the historic Pony Express trail.
U.S. Bureau of Land Management spokesman Chris Hanefeld said Tuesday that the fire about 5 miles south of the Ruby Lake National Wildlife Refuge isn't threatening structures.
No injuries have been reported.
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More than 50 firefighters and several air tankers were battling the fire in pinion-juniper, sage and grass.
It was discovered Monday after a lightning strike.
Hanefeld says it could be contained this weekend.