Three snowmobilers were partially buried by debris when they were caught in an avalanche north of Granby on Saturday.

Officials at the Colorado Avalanche Information Center are urging skiers, snowboarders, and others in the mountains to be careful after an avalanche killed a 41-year-old woman from Crested Butte was killed in an avalanche near Silverton.

In a separate incident, four people caught in another avalanche escaped serious injury, Colorado officials say.

A snowboarder was killed in an avalanche in the mountains of southwestern Colorado on Thursday, the fourth person to die in an avalanche in the U.S. West this week after a string of winter storms. Sarah Steinwand,

The victim was traveling on a terrain feature known as The Nose near Silverton, Colo., when the avalanche occurred on Thursday, officials said.