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

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.

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

A preliminary report on last month’s Jeju Air plane crash on Monday confirmed that birds struck the passenger jet's engines but cautioned that investigators were still probing the cause of the

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South Korean authorities are to carry out an "all-out investigation" into the fatal crash involving a Jeju Air Boeing 737-800, as they release the preliminary report into the 29 December accident.

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