(CNN) -- A lightning strike on a trail in Rocky Mountain National Park, Colorado, left one woman dead and seven people injured.
The strike occurred Friday on the Ute Crossing Trail, park spokeswoman Kyle Patterson said.
The seven injured hikers were treated at the Estes Park Medical Center. Their names have not been released.
Dr. Martin Koschnitzke, of the Estes Park Medical Center, speaking to CNN affiliate KUSA, urged walkers to be aware of changing weather conditions.
"We can't emphasize enough that when it starts getting dark and clouds are forming, it's time to get down," he said. "My understanding is this group was actually in the process of doing that and still got caught, which is really a sad thing."
Medical officials told KUSA that three people still in the hospital Friday evening were being treated for burns, lacerations and broken bones.