July 18, 2015 3:04 PM EDT

A lightning strike Friday in the Rocky Mountains killed one hiker and injured three more.

The hiker who was killed was a 31-year-old woman from the Denver area hiking Colorado’s Mount Yale Trail. Two other injured hikers navigated to the base of the mountain independently, while a third was airlifted to the hospital in Colorado Springs.

Rescue attempts were complicated by a variety of factors; there is no cellular service in the area where lightning struck, so a 911 call was delayed until witnesses made it further downhill. Responders were also delayed due to the steepness of the trail.

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