Federal officials on Saturday ordered the immediate grounding of Boeing 737-9 Max jetliners after an Alaska Airlines plane suffered a blowout that left a gaping hole in the side of the fuselage.

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An Alaska Airlines jetliner blew out a window and a portion of its fuselage shortly after takeoff three miles above Oregon late Friday, creating a gaping hole that forced the pilots to make an emergency landing as its 174 passengers and six crew members donned oxygen masks.

No one was seriously hurt as the depressurized plane returned safely to Portland International Airport about 20 minutes after it had departed, but the airline grounded its 65 Boeing 737-9 Max aircraft until they can be inspected. The National Transportation Safety Board said Saturday it will also investigate.