LAS VEGAS (AP) — Arson investigators in Las Vegas are probing a fire that critically injured a man on the unoccupied 22nd floor of the downtown Golden Nugget hotel.

Las Vegas fire spokesman Tim Szymanski says firefighters found the unconscious man in a guest room in the hotel’s Rush Tower after fire sprinklers doused flames at about 8:30 a.m. Thursday.

The 22nd floor is among several being renovated, but officials say it’s not clear if the man was a worker or an intruder.

Golden Nugget spokeswoman Amy Chasey says about 60 people evacuated from the 21st floor, and nine left suites on the top floor, the 25th. Three floors in between are unoccupied.

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