One climber dead, another seriously injured after falling 1,000 feet on Alaska mountain

One person is dead and another is seriously injured after the pair fell about 1,000 feet while climbing a mountain in Alaska. 

The unnamed climbers were scaling Mt. Johnson, an 8,400-foot peak in Denali National Park, the National Park Service said in a news release. The climbers were ascending a part of the mountain known as "The Escalator," which is on the mountain's southeast face. The route requires navigating a mix of "steep rock, ice and snow" for about 5,000 feet, the NPS said. 

Another climbing party on the route saw the pair fall, the NPS said. The second group alerted the Alaska Regional Communication Center to the incident at about 10:45 p.m. on Thursday night. The second group then descended to the accident victims.