The two campers who started the fire have been detained, Carson City Sheriff Ken Furlong told the Reno Gazette-Journal.
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The Humboldt Toiyabe National Forest said in a tweet Wednesday morning that the 500-acre fire, dubbed the Voltaire Fire, was 15 percent contained.
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Carson City Fire Chief Sean Slamon said firefighters had a tough time with the fire Tuesday night since they didn't have air support.
The Associated Press contributed to this report.