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.

Avalanche buries 3 skiers near Anchorage, officials say Three heli-skiers were buried in an avalanche near Girdwood, Alaska, authorities said Wednesday. (Mark Thiessen / Associated Press) ...

Three men were feared dead after they were swept away in an avalanche while on a helicopter skiing trip outside Anchorage on Tuesday, officials in Alaska said.