BELLINGHAM, Wash. (AP) — Two Boy Scouts and two troop leaders were hospitalized in serious condition and undergoing treatment for hypothermia Monday after spending a night inside a cave high up Mount Baker in Washington state, officials said.

Whatcom County Sheriff’s Office said the four sought shelter in the cave on the 10,781-foot (3,286-meter) peak after they became separated from other members of their troop, KING-TV in Seattle reported.

Mount Baker is about 15 miles (24 kilometers) from the Canadian border and is part of the Cascade Mountain range.

The snow-capped peak can be a challenging climb. All summit routes feature glaciers.

The 13-year-old boys and two adults were airlifted to a hospital and were being treated for hypothermia, the station said. Authorities did not identify them.

A man, a woman and two boys were in serious condition Monday afternoon at PeaceHealth St. Joseph Medical Center in the city of Bellingham near the peak, spokeswoman Hilary Andrade told The Associated Press.

She said they will be transferred soon to another facility but declined to say where, citing patient privacy issues.

The four had been reported missing Sunday and a search was started that afternoon.

Sheriff’s Deputy Mark Jilk, who helps manage search and rescue operations, told the Herald earlier Monday that two adults and two 13-year-old boys were using a popular route on the peak’s north face.

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