The rocks slammed into the car as it was driving Monday night, smashing through the rear windshield.
A Utah 14-year-old girl was killed when a rockslide hit her family's car at Glacier National Park in Montana.
The rocks slammed into the car as it was driving Monday night, smashing through the rear windshield. Two other children in the vehicle were injured in the rockslide, as were the teen's parents, the park said in a statement.
One witness told CBS News she heard a woman "frantically screaming" after the rocks hit the car.
"I could clearly hear a woman crying, frantically screaming, you know, 'Please help her. Someone please just help her,'" Pat Cummings said.
Cummings added that the damage could have been much worse had there been more cars on the road.
A park spokesperson said it's unusual to see a rockfall of this magnitude. The last deadly rockslide on this particular road was in 1996.
The teen killed has not yet been publicly identified.
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