The fire, apparently sparked in oil-soaked towels, was extinguished in about five minutes, the Boise Fire Department reported on Twitter.
One employee was treated at the scene for smoke inhalation, KBOI-TV, Channel 2 reports.
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The fire was called in 8:50 p.m. at the hotel, 2900 Chinden Blvd., and was confined to a laundry area that is separate from the hotel building, the fire department reports. A fire sprinkler helped control the spread of the fire, according the BFD.