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Caused by lightning –

[snip] . . . .   Wildland firefighters battled more than just the usual Nevada brush blaze this week. They had to contend with the possibility of radiation.

Lightning sparked two fires Tuesday within the Nevada National Security Site, the former nuclear test site 65 miles northwest of Las Vegas. By Friday, the fires had consumed more than 6,000 acres, with the smaller blaze fully contained and the larger only 25 percent contained. . . .

http://www.lvrj.com/news/lightning-sparked-blazes-at-nuclear-test-areas-125260084.html?ref=084