South Korea’s authorities investigating last month’s Jeju Air plane crash have submitted a preliminary accident report to the UN aviation agency and to the authorities of the United States, France and Thailand,

The preliminary report was released by the Aviation and Railway Accident Investigation Board on Monday in South Korea.

The investigation into the deadliest air disaster on the country's soil remains ongoing, focusing on the role of bird strike and involving an analysis of the engines and the "localizer" landing guidance structure.

Investigators say they have found evidence of a bird strike on a passenger plane that crashed in South Korea in December and killed 179 people. The feathers and blood stains on both engines of the Jeju Air plane were from the Baikal teal,

Jeju Air Accident Prelim Report Says Ducks Ingested By Both Engines is published in Aviation Daily, an Aviation Week Intelligence Network (AWIN) Market Briefing and is included with your AWIN membership. Already a member of AWIN or subscribe to Aviation Daily through your company? Login with your existing email and password

The first report on last month’s Jeju Air crash in South Korea has confirmed traces of bird strikes in the plane’s engines, though officials haven’t determined the cause of the accident that killed all but two of the 181 people on board.

Pilots’ actions after the bird strike are an early focus of the investigation, according to people familiar with the probe.

Both engines of the Jeju Air plane that crashed last month contained duck remains, according to a preliminary report.

Authorities have suggested that migratory bird strikes were the cause of last month's deadly plane crash in South Korea, according to multiple reports.

Duck remains were found in both engines of the Jeju passenger jet that crashed last month, killing 179 people in the worst air disaster in South Korea’s history.