Four skiers killed in US avalanche
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The Utah Avalanche Center, which documents avalanches in the region, said it was the highest toll since 1992.
Local TV station KSTU reported police first received a faint distress call around 11.40 am (1840 GMT).
"This is a terrible tragedy and our prayers go out to the victims and families involved," tweeted Utah Governor Spencer Cox.
"We are grateful to the first responders and others who engaged in this rescue and recovery effort. With avalanche danger high right now, please exercise extreme caution."