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 said a pressurization issue on a Delta Air Lines flight Sunday left them with bloody noses and ears.