DENALI NATIONAL PARK AND PRESERVE — Rescuers are attempting to reach four climbers who fell near Denali Pass on Mount McKinley, North America’s tallest peak. The fall occurred at approximately 18,200 feet (5,547 meters) and was reported to Denali National Park and Preserve rangers overnight.

The climbers’ conditions were not immediately known following the fall. The four individuals were part of a seven-person team; the three other climbers attended to those who fell and then returned to high camp, located around 17,000 feet (5,181 meters).

Park officials have been in contact with the three climbers who returned to camp, according to park service spokesperson Scott Carr. Rangers are seeking a weather window to allow them to reach the area by helicopter, but conditions throughout the day have been variable, with low cloud ceilings and limited visibility. “Weather conditions did not improve the way rescuers had hoped.”

“Helicopter operations will start when a weather window opens up.” Authorities were still awaiting an opportunity to safely fly as of the latest update.

Mount McKinley, which stands at about 20,310 feet (6,190 meters), presents climbing hazards, particularly on the traverse between high camp and Denali Pass. According to the park, many climbing injuries and deaths over the years have occurred in that section, mainly resulting from unprotected falls. Park rangers and mountain guides install and maintain snow pickets in the area to help build anchors for extra protection on steep slopes. Climbers are urged to carry their own pickets in case the protection placed by rangers and guides is missing.

“Additional information would be released if and when it becomes appropriate.” There were 516 climbers on the mountain as of Thursday, during a typical climbing season that begins in late April and continues into mid-July.