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Story summary
- Eight people died in the trip led by Blackbird Mountain Guides in California's Sierra Nevada, with one person still missing.
- Blackbird Mountain Guides had previously warned of avalanche risks from a weak snow layer during its high-end adventures and safety courses.
- The company said it is supporting search and rescue operations and is in communication with the victims' families.
- The incident underscores the dangers of backcountry skiing.
