A passenger opened a door on an Asiana Airlines flight that then landed safely at a South Korean airport Friday, airline and government officials said.
Some people tried to stop the person from opening the door, but it was eventually partially opened, the transport ministry said.
The plane, with 194 people on board, was heading to Daegu from the southern island of Jeju. The flight is normally about an hour and how long the door was open was not immediately disclosed.
Police say the unidentified person who opened the door has been arrested. The reason for their departure was not immediately known.
The passengers included teenage athletes who are planning to attend track and field competitions in Ulsan, another southeastern city.
The incident scared some passengers but no one was injured, though some passengers were assessed at a hospital, Asiana and transport ministry officials said.