Boeing is being sanctioned by U.S. investigators for sharing information about a federal investigation of a door plug blowout that left a gaping hole in a Boeing 737 Max 9.

The National Transportation Safety Board said Thursday that Boeing blatantly violated the agencys investigative regulations as well as a signed agreement by providing non-public investigative information to the media and speculating about possible causes of the Jan. 5 door plug blowout on a Boeing passenger jet in Portland, Oregon.

During the incident, a panel that plugged a space left for an extra emergency door blew off an Alaska Airlines Max 9. Pilots were able to land safely, and there were no injuries.