On Friday, searchers probed miles of icy tundra and flew over expanses of ice-covered seas in western Alaska seeking any indication of a plane that vanished while transporting 10 people

Planes carry transponders that transmit their real-time location. The Alaska plane stopped sharing that data on Thursday.

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.