A man jumped out of taxiing airplane at Phoenix's Sky Harbor International Airport - CNN

Southwest Flight 4236 arrived safely in Phoenix from Colorado Springs, Southwest Airlines said in a statement.

"Initial reports indicate that while the flight was taxing to the gate, a Customer onboard exited the aircraft via a rear galley door," Southwest Airlines spokesperson Dan Landson said.

"The flight's Captain stopped the aircraft and notified Air Traffic Control (ATC)."

It is unclear how the aircraft door was opened.

Sky Harbor International Airport has not responded to CNN's request for comment.

Phoenix Fire Station 19, which is located at the airport, was notified of the incident at around 8 a.m., Phoenix Fire Department Captain Todd Keller said in a statement.