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The FAA is investigating Boeing after a door plug blew out during a flight.

The agency ordered a temporary grounding of all Boeing 737 Max 9 airplanes after the incident occurred on an Alaska Airlines flight over the weekend, but now it’s opening a formal investigation.

A group of senators are also pushing Boeing to cooperate with an investigation from the NTSB, which will focus on missing or loose bolts meant to hold the door plug in place — something United Airlines also found on its Boeing 737 Max 9 planes.