It said the danger rating in the area was at level three, on a scale of one to five, and told skiers to “remain vigilant while traveling in the backcountry.”

The state had issued a warning for the San Juan Mountains area on its website Sunday, saying human-triggered avalanches were likely to occur on steep slopes with 6 or more inches of new or drifted snow.

“An avalanche in the surface snow could step down to lower weak layers, triggering a larger and more dangerous avalanche,” the warning said. “You can trigger an avalanche today that is large enough to injure or kill you. “

Colorado Avalanche Information Center said it sent staff to review the scene and planned to release a detailed report later this week.

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