A commuter plane that fell from the sky as it flew over Alaska’s Norton Sound last month was more than 1,000 pounds overweight at the time of takeoff, according to a preliminary report released by

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.

A preliminary report from the National Transportation Safety Board said the commuter plane that crashed in Alaska, killing 10, was overweight for the weather.