SALT LAKE CITY (AP) — The Federal Aviation Administration is investigating after a Delta Air Lines flight with pressurization issues left some passengers with bleeding eardrums, headaches and bloody noses.

The flight was traveling Sunday from Salt Lake City to Portland, Oregon, when pilots noticed a pressurization problem and made an emergency landing back in Salt Lake City.

Passengers told television station KSL they noticed people bleeding as the plane decreased in elevation.

Paramedics met passengers at the gate and identified at least 10 people out of the 140 on the flight who required medical attention.

The airline said the plane was taken out of service Sunday morning and went back into service Monday.

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