(CNN) -- An 11-year-old girl was killed and her mother injured when a chunk of ice struck them near a cave attraction in Washington state.
The two were on a family outing Saturday near the Big Four ice caves in Mount Baker-Snoqualmie National Forest, authorities said.
The pair was not in or on the caves, said Lt. Jeff Brand of the Snohomish County Sheriff's Office.
The 11-year-old girl died after an ice patch fell on her head, he said. Her mother was injured in the leg, but she was not hospitalized.
Brand said ice at the popular attraction is melting so much this year that it is not stable, and warned visitors to stay away from the ice caves.
No more information was immediately available.