Country music icon Willie Nelson blamed the altitude after he left the stage early with "breathing problems" during a concert Sunday night near Salt Lake City, Billboard reports.
Nelson, 84, apologized to fans in a statement provided to Variety.
"This is Willie. I am very sorry to have to cut the Salt Lake City performance short tonight," the statement read. "The altitude just got to me. I am feeling a lot better now and headed for lower ground."
Early Monday, the singer tweeted a similar message from his verified account.
The venue, USANA Amphitheatre, is in West Valley City, Utah, which is more than 4,300 feet above sea level, Variety reported.
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