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 Boeing 737-800 crash-landed in South Korea on December 29 killing all but two of the 181 people on board. Authorities have found bird remains in the plane's engines

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.

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

South Korean officials investigating the fatal Jeju Air crash have published a preliminary report of the accident.

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

The first report on last month’s Jeju Air crash in South Korea confirmed 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.

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.