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GRANBY, Colo. — A mother and her two daughters fell from a chairlift at Ski Granby Ranch on Thursday morning, according to authorities.

Authorities said the fall killed the mother and injured her two daughters. An autopsy on the mother is planned for Friday or Saturday.

The family was visiting Colorado from San Antonio. A 12-year-old girl was treated and released at a hospital in Granby. Her 9-year-old sister airlifted to Children’s Hospital Colorado in Aurora.

The 25-foot fall killed the 40-year-old mother, later identified as Kelly Huber, who was pronounced dead at a Granby emergency room, according to authorities.

Town police officers and Grand County sheriff’s deputies are investigating what caused the fall.

The Colorado Passenger Tramway Safety Board is also investigating, saying late Thursday the lift will be closed until deemed safe for public use.

The condition for the 9-year-old at Children’s Hospital Colorado was unknown as of Friday morning.

A Texas family member said the father of the woman who was killed was flying to Colorado on Thursday night.