The Alaska commuter plane that disappeared last month before its wreck was discovered with all 10 onboard dead was more than 1,000 pounds overweight at the time of takeoff, according to details of a preliminary investigation released Wednesday.

A small passenger plane that crashed last month in Alaska, killing all 10 onboard, was nearly 1,000 pounds too heavy for the weather conditions, according to a preliminary report on the incident released Wednesday.

A commuter plane that crashed on sea ice off Alaska, killing all 10 people on board, was half a ton overweight for the weather conditions, the National Transportation Safety Board said in a preliminary report released Wednesday.