The Bonneville County, Idaho Sheriff’s Office says 39 year-old Rex Andersen of Arco was killed about 3:00 pm Thursday afternoon in an avalanche in Neely’s Cover near Palisades Peak just west of the Idaho-Wyoming state line near Irwin. Anderson had been snowmobiling with three friends in the area. Members of the group say they had ascended a steep slope. Andersen was the fourth when the slope gave way just before he reached the top. He was ultimately buried as he tried to outrun the slide. Officials say Andersen was buried for almost 10 minutes before friends with avalanche beacons located him, unburied him and began CPR. Efforts to revive Anderson continued for 20 minutes until it appeared Andersen would not respond. Air Idaho Rescue then flew Andersen to the Driggs hospital at the request of his family. The Bonneville County Sheriff’s Office is warning the public that recent storms have left unsafe conditions in the back country, and recreationists should take the proper safety equipment, ride with groups of responsible riders and should not take any unnecessary risks.