Three members of a Latvian climbing expedition have died in an accident high on Mount McKinley in Alaska’s Denali National Park, according to the Latvian Mountaineering Association. A fourth climber was rescued and is in critical condition, the organization said. Mount McKinley, with a summit of 20,310 feet above sea level, is the highest peak in North America. The accident occurred Wednesday at about 18,000 feet, according to the U.S. National Park Service.