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, 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. The teen killed has not yet been publicly identified.