The probe comes as families of victims say they have “many unanswered questions”

The young girl and the father were killed in separate incidents this week, the latest in a string of avalanche deaths in the West.

A snowmobiler died near Snake Creek, southeast of Salt Lake City, and a skier died after a slide in Big Cottonwood Canyon the next day, according to officials. Over 60 slides were reported in two

A group of close friends and experienced skiers had long planned a backcountry trip in the rugged Sierra Nevada Mountains, but their trek ended in tragedy as a football-field-sized crush of snow and ice overtook their tour.