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

The slide happened on Gravel Mountain near Grand Lake just before 2:30 p.m. The Colorado Avalanche Information Center said that three or four people were caught in the avalanche, but were able to get out on their own or with the help of bystanders. It is believed to have been triggered by a snowmobile.

Few details were immediately available but a sheriff's office spokesperson said the avalanche was triggered around 4:45 p.m. in the "Fingers Area" on Berthoud Pass near Winter Park.

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

One person was killed Saturday when a skier triggered an avalanche in Colorado, the Grand County Sheriff's Office said in a statement.