SALT LAKE CITY (AP) — The Federal Aviation Administration is investigating after a Delta Air Lines flight leaving Salt Lake City last weekend developed cabin pressure issues and left some passengers with bleeding eardrums, headaches and bloody noses.

Authorities are investigating a flight that turned around after the aircraft did not properly pressurize. Passengers bled from the ear and nose, local media said.

Passengers onboard a Delta Air Lines flight from Salt Lake City, Utah to Portland, Oregon experienced bleeding eardrums, noses and headaches due to cabin pressure issues. The Federal Aviation Administration (FAA) is currently investigating the flight,