A Ryanair flight traveling from Thessaloniki, Greece, to Memmingen, Germany, made an emergency return shortly after takeoff after a passenger window dislodged during flight, airline and media reports said.

According to passengers and Greek media accounts, the incident caused an abrupt change in cabin conditions and triggered a rapid decompression, with oxygen masks falling from the ceiling. Witnesses described hearing a loud noise, followed by screams as the cabin environment shifted.

Several reports said a 61-year-old Serbian passenger was pulled toward the broken opening and had his upper body outside the window for a period before other passengers helped restrain him and bring him back into the cabin. The passenger was later taken to hospital and treated for friction burns and injuries including to the neck and shoulders, with authorities describing his condition as stable.

Ryanair said the aircraft landed normally at Thessaloniki and that one passenger received medical assistance on the ground. The airline also said it arranged a replacement aircraft to minimize disruption and bring the remaining passengers to their destination after the return.

Greek aviation and airport authorities reported that investigations were underway into what caused the window to detach in flight, including whether debris from an engine was involved. Regulators including the European Union Aviation Safety Agency and the FAA said they were aware of the incident and would support the investigation as appropriate.