Two ski patrol members were trying to mitigate the threat of an avalanche after a storm had dumped about 6 feet of snow on ...

Mammoth Mountain officials said the slide occurred during avalanche mitigation work following a significant Sierra Nevada snowstorm, during which about six feet of snow fell in 36 hours.

Two people were trapped, one seriously injured in an avalanche at Mammoth Mountain Friday morning during mitigation work following the powerful snowstorm.