The regional airline flight in Alaska that crashed, killing all 10 people onboard, was overweight before it took off, according to a preliminary report released Wednesday by the National Transportation Safety Board.

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.

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.