Avalanche near Lake Tahoe leaves 10 skiers missing as rescuers race through treacherous conditions

An avalanche at Castle Peak near Truckee, Calif., trapped a 16-person backcountry group including four guides, leaving 10 skiers unaccounted for and six survivors awaiting rescue as authorities battled treacherous conditions; roughly 46 rescuers were en route amid heavy snow, blizzard conditions, and a high avalanche danger warning in the Sierra Nevada, with I-80 closed and search efforts slowed by the risk of additional slides.