(CNN) A rockfall came through a climbers' camp this week on Washington's Mount Rainier, killing one person and injuring two others, a park spokesman said.

The rocks hit a camp of six climbers on the mountain's Liberty Ridge route at 10,400 feet Wednesday night, Mount Rainier National Park spokesman Kevin Bacher said.

Responding to a call about the rockfall, search and rescue workers air-lifted a severely injured climber to Seattle's Harborview Medical Center on Thursday morning, Bacher said. The rest, including three uninjured campers, were flown off the mountain later that day, he said.

The severely injured patient, a 37-year-old man, was in serious condition Friday morning in intensive care at Harborview, University of Washington Medical Center spokeswoman Susan Gregg said.

The climbers had intended to climb the summit Thursday.

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