Nine people, including six female skiers and three professional guides, were killed in a massive avalanche in California’s Sierra Nevada mountains, described as the most deadly avalanche in the United States in 45 years. The victims were on a three-day backcountry skiing expedition under the supervision of experienced guides when the avalanche struck on Tuesday morning as they prepared to return. A snow layer the size of a football field collapsed suddenly, burying them within seconds.

Rescue teams faced severe wind and near-zero visibility, delaying operations. Six people were rescued alive, but nine others could not be saved. Authorities have launched an investigation to determine whether negligence played a role. The Nevada County Sheriff’s Office reported that the site remains dangerous, with one person still missing.

The tragedy has cast a shadow of grief over the community. Psychologist Sara Boylen said the incident has caused deep emotional trauma for mountain enthusiasts, turning a place of peace into one of loss.