Investigators probing the January midair collision of a passenger plane and an Army helicopter over Washington that killed 67 people found the chopper was flying higher than it should have been and its altitude readings were inaccurate.

The details came out of the first day of National Transportation Safety Board hearings in Washington, where investigators aim to uncover insights into what caused the crash between the American Airlines plane from Wichita, Kansas, and the Black Hawk helicopter over Ronald Reagan National Airport.

The board opened the three days of hearings by showing an animation and playing audio and video from the night of the collision, as well as questioning witnesses and investigators about how the Federal Aviation Administration and the Army may have contributed

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