A mother is dead after she and her two daughters fell off a chairlift at Granby Ranch ski area on Thursday morning.

Investigators say the mother, a 40-year-old woman from San Antonio, Texas, fell off the Quickdraw Lift around 9:30 a.m. when it was halfway up the slope. Her two daughters, ages 9 and 12, also fell. Both were injured, but one has been released from the hospital.

Firefighters did not say how they fell, or if suspicious circumstances were involved.

RELATED: Fatal falls from chair lifts are rare in U.S.

Names are not being released at this time.

Granby Ranch is located approximately 20 miles west of Winter Park.