Officials investigate deadly California avalanche for possible criminal negligence
Nevada county sheriff said investigation includes learning why the ski trip was not cancelled by the guide company

TL;DR
- At least eight skiers and guides died in a deadly avalanche at Lake Tahoe.
- Authorities are investigating the guide company, Blackbird Mountain Guides, for criminal negligence.
- The investigation will focus on why the three-day backcountry skiing trip was not cancelled despite avalanche warnings.
- Recovery efforts for the victims have been hindered by adverse weather and ongoing avalanche danger.
- Six skiers survived the avalanche and were rescued.
- Avalanche mitigation efforts, including controlled explosive deployment, are underway in the Sierra Nevada.