Rescue efforts underway for four climbers who fell on Mount McKinley

Rangers are currently awaiting a suitable weather window to allow a helicopter to access the area - (AP)

Rescuers are attempting to reach four climbers who fell on Alaska's Mount McKinley, North America’s tallest peak, the National Park Service confirmed Thursday.

The climbers' conditions remain unknown following the incident, which was reported to Denali National Park and Preserve rangers overnight.