Nevada county sheriff said investigation includes learning why the ski trip was not cancelled by the guide company

Authorities are investigating whether any criminal negligence was involved in the deadly avalanche that swept California’s Lake Tahoe this week, which killed at least eight skiers and their guides while returning from a three-day backcountry skiing trip.

The Nevada county sheriff’s office said on Friday said that they notified the Occupational Safety and Health Administration (Osha), which regulates workplace safety, of the active investigation.

“We are investigating the incident to determine if there were any factors that would be considered criminal negligence,” said a spokesperson for the sheriff’s office. “It is too early to know if criminal charges will be applicable, as the investigation is preliminary and remains active and ongoing. The district attorney’s office would ultimately be the determining authority for any criminal charges to be filed.”

The avalanche, the deadliest in California’s modern history, killed at least eight people and a ninth skier is still missing but is presumed dead.