Washington officials have said that an accident at the Big Four ice caves in Mount Baker-Snoqualmie National Forest killed an 11-year-old girl and injured her mother.

The victims' family was on an outing to the caves on Saturday, KOMO-TV, Seattle, has reported. Snohomish County sheriff's spokesman Jeff Brand said that the mother and daughter were standing on an ice field when a massive chunk of ice tumbled down.

According to the report, struck by the falling ice, the girl later died of her injuries. The girl's mother suffered injuries and was taken to a hospital. There was no word on her condition.

Signs at the site warn of the dangers of entering the caves, said KOMO. The mother and daughter were not inside a cave, but were standing next to them, Brand had said.

It has also been reported that the names of the victims were not included in the report. (With Inputs from Agencies)