Authorities in Wyoming say a mile-long avalanche has killed three snowmobilers near the Wyoming-Idaho state line.

Lincoln County officials say the three victims were among four snowmobilers caught by the snow slide Friday near Alpine in the Snake River Range.

Sgt. Shane Tindall said the fourth person walked out and used his cell phone to call for help.

The slide was about 100 yards wide and a mile long.

Tindall said rescue workers set off explosive charges to reduce the risk of a second slide before attempting to recover the victims.

Names of the victims had not been released.