Four hikers who became stranded on Mount Katahdin’s Knife Edge on Thursday night were rescued Friday.

A woman who sustained an “unstable knee injury,” according to park officials, was airlifted off the exposed ridge by a Maine Army National Guard Blackhawk helicopter around 5:45 p.m. The injured hiker, Beata Kosc, 47, of New York, was flown to Millinocket Airport and taken to a hospital, according a report by WCSH News Center Maine.

The three other hikers were not injured and were safely escorted down the mountain earlier Friday afternoon. One was Courtney Doyon, 32, of South Portland, but the other two were not identified, WCSH reported.

Rangers from Baxter State Park’s Chimney Pond station reached the hikers Friday morning to provide food, hot liquids and dry clothes, but cloudy conditions on the mountain were preventing a helicopter from carrying out the evacuation at that time.

The two hiking parties became stranded after dark Thursday, Baxter State Park Director Kevin Adam wrote in a release. Rescuers from the Maine Forest Service Friday morning were evaluating “when they may be able to fly to that altitude and rescue the injured hiker,” Adam said.

This story will be updated.