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Mountain Tragedy

Three Mammoth Mountain ski patrol members were killed April 6 after they were overcome by noxious gases following a fall into a deep gas vent, a natural hazard on the mountain. (Brian Vander Brug / LAT)
Three members of the Mammoth Mountain ski patrol were killed yesterday morning after falling into a deep gas vent, a natural hazard on the mountain. They were overcome by noxious gases. (Brian Vander Brug / LAT)
Mammoth Mountain ski hosts stand along a roped-off area to insure guests do not approach the Christmas Bowl area where three Mammoth Mountain ski patrol members died yesterday. They were overcome by noxious gases following a fall into a deep gas vent. (Brian Vander Brug / LAT)
Mammoth Mountain CEO Rusty Gregory outlines what happened to three ski patrol members yesterday. They were killed after falling into a deep volcanic vent. (Brian Vander Brug / LAT)
A skier passes by during a press conference with Mammoth Fire Department Chief Brent Harper this morning. Three members of the Mammoth Mountain ski patrol were killed yesterday morning after falling into a deep volcanic vent. (Brian Vander Brug / LAT)
Bill Cockroft, Mammoth Mountain senior vice president, secures a fence post in the area where snow collapsed around a deep gas vent in Christmas Bowl. Three Mammoth Mountain ski patrol members were killed yesterday morning following a fall into a deep gas vent. (Brian Vander Brug / LAT)
This is a sign similar to ones posted near gas vents on Mammoth Mountain. Three Mammoth Mountain ski patrol members died yesterday after they were overcome by noxious gases following a fall into a deep gas vent. (Brian Vander Brug / LAT)
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