It isn’t yet clear what specific role the weight might have played in the Bering Air Cessna Caravan’s crash, and whether other factors were involved.

The National Transportation Safety Board says a commuter plane that crashed on sea ice off Alaska and killed all 10 people on board was half a ton overweight for the known or possible weather conditions in the area.

Freezing rain was reported in Nome at the time of the crash. A large weather front over Western Alaska created the potential for ice buildup as the plane neared the airport, according to the NTSB report.