A male climber believed to be in his early twenties was airlifted to a Denver hospital today after falling approximately 65-feet off a rock formation he was climbing.

The victim was “scrambling” alone on Red Rocks, a formation near the Mount Sanitas Trail and Settler’s Park in Boulder. Scrambling is a cross between hiking and climbing, mostly without ropes.

The man fell at approximately 11:42 a.m., when nearby hikers heard him yelling for help and called 9-1-1. The Boulder Fire Department, AMR Ambulance, Boulder Open Space and Mountain Parks rangers, the Boulder Sheriff’s Department and members of Rocky Mountain Rescue responded.

The victim was airlifted to St. Anthony’s Central Hospital in Denver. It’s believed that the man suffered severe head trauma and other injuries, but further details are not available at this time. The victim’s boots were untied, and one was found partway up the rocks.

The victim’s identity is not available.