An investigation is underway after a snow biker was killed in an avalanche in southern Montana.The Gallatin National Forest Avalanche Center reports the motorized snow bike triggered the slide on Miller Mountain in the Sheep Creek Drainage north of Cooke City on Saturday evening. The biker, whose identity has not been made public, was carried through cliffs and partially buried.

East Idaho News reports At least 10 people have died in avalanches in the U.S. so far this winter season, according to the Colorado Avalanche Information Center, which keeps track of fatalities nationwide.

Here’s Doug Chabot of the GNFAC at the scene of the slide outside Cooke City in Sheep Creek on the south face of Miller Mountain.