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A medical helicopter located the wreckage Sunday morning, but whiteout conditions prevented the aircraft crew from carrying out an immediate rescue, said Col. Tim Marsano of the Idaho National Guard.

Rescuers who walked through 6-foot snowdrifts and on 60-degree slopes reached the crash site first. They wrapped the family members in blankets and built a fire until a military helicopter could lift them out with a hoist.

It’s unclear what caused the Cessna to go down. Photos taken by rescuers showed significant damage, including a broken front windshield.

From wire dispatches and staff reports