Authorities are investigating the avalanche, including whether criminal negligence played a role in the tragedy, a sheriff's office leading one of several investigations said Friday. (REUTERS)

Controlled explosions set off to recover bodies of avalanche casualties in California’s Sierra Nevada

Officials worked to lower the risks of more deadly slides Friday by setting off controlled explosions in the area where an avalanche struck in California’s Sierra Nevada so crews could safely recover the bodies of the people killed. Authorities are investigating the avalanche, including whether criminal negligence played a role in the tragedy, a sheriff’s…

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A snowcat is seen driving down the road on Donner Summit on Wednesday. (William Hale Irwin/For the S.F. Chronicle)

Why did skiers leave shelter in blizzard conditions?

With nine people feared dead northwest of Lake Tahoe in California’s deadliest avalanche in decades, authorities and experts are seeking to understand what led a group of backcountry skiers, including four professional guides, to venture into the snow and away from shelter amid blizzard conditions. Among the questions: What went into the 15-member group’s decision…

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