The search continues Friday for a small plane that went missing in Alaska, with 10 people on board. The Bering Air flight was traveling from the village of Unalakleet to Nome when it was reported missing at around 4 p.m. local time Thursday, according to the Alaska Department of Public Safety, State Troopers.

According to U.S. Civil Air Patrol, radar data shows the plane quickly slowing down and losing altitude, but it still isn’t clear what exactly caused the plane to crash. But authorities had reason to believe the plane had either gone down over land or was still on the sea ice because it was equipped with an emergency transmitter that would have automatically sent the plane’s location to the Coast Guard if it had been exposed to saltwater.

The commuter flight that crashed on Alaska sea ice last week was part of the workhorse network of short-hop flights that people in the vast state rely on for routine.