The Bering Air Caravan, a single-engine turboprop, was heading from Unalakleet to Nome on Thursday afternoon with nine passengers and a pilot, according to Alaska's Department of Public Safety. Authorities were working to determine its last known coordinates.

The disappearance marks the third major incident in U.S. aviation in eight days. The Bering Air Caravan, a single-engine turboprop, was heading from Unalakleet to Nome.

The U.S. Coast Guard in Alaska found the wreckage of a small plane atop frozen sea ice on Friday, after the aircraft suddenly lost altitude on Thursday and the crash killed all 10 people on board, officials said.