Alaska Airlines has temporarily grounded its fleet of Boeing 737-9 Max aircraft after one of its planes made an emergency landing in Oregon Friday, officials said – an incident that a passenger says involved a panel and window blowing out in flight.

Alaska Airlines Flight 1282, which was headed from Portland to Ontario, Califorina, returned safely to Portland International Airport around 5 p.m. PT after “the crew reported a pressurization issue,” the Federal Aviation Administration said.

A panel of the fuselage, including the panel’s window, popped off shortly after takeoff, Kyle Rinker,

Firefighters were called to assess minor injuries after the landing, and no serious injuries were reported, the Port of Portland Fire Department said.

A passenger’s video posted to social media shows a side section of the fuselage, where a window would have been, missing – exposing passengers to the outside air. The video, which appears to have been taken from several rows behind the incident, shows oxygen masks deployed throughout the airplane, and least two people sitting near and just behind the missing section.

In a statement late Friday, Alaska Airlines said it was working with Boeing to understand what took place on Flight 1282. The aircraft is a 737 Max 9 that received its certificate of airworthiness on October 25, 2023, according to the FAA.

The airline’s grounded fleet of 65 Boeing 737-9 aircraft is expected to undergo full maintenance and safety inspections over the next several days before being returned to service, the airline said.

“My heart goes out to those who were on this flight – I am so sorry for what you experienced,” Alaska Airlines CEO, Ben Minicucci said in a statement.

Though the airline has acknowledged an incident on Friday’s Flight 1282, it has not detailed what the incident entailed. The plane “landed safely back at Portland International Airport with 171 guests and six crew members,” the airline said.

According to FlightAware, the flight was airborne for about 20 minutes. The plane departed from Portland International Airport around 5:07 p.m. local time and landed at 5:27 p.m.

The FAA and National Transportation Safety Board will investigate the incident, both agencies said.