PINKHAM NOTCH, N.H. (AP) — New Hampshire authorities say a woman attempting to hike up Mount Washington in below-freezing conditions suffered an unknown medical condition and died.

Officials say that 63-year-old Sandra Lee, of Mount Tabor, New Jersey, was hiking with two family members on Thursday while ascending a trail on the Northeast’s highest peak. They called 911 after Lee appeared to show symptoms of hypothermia and couldn’t continue.

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New Hampshire state parks staff based at the summit went down the trail and gave warm clothing to the hikers. It was icy with a wind chill of minus 12 degrees (minus 24.4 degrees Celsius) and 60 mph winds.

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Two conservation officers carried Lee two-tenths of a mile (321 meters) to Mount Washington Auto Road, where an ambulance took her to a hospital.

Lee was later pronounced dead at the hospital.

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