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.

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

South Korea released a preliminary report into last month’s deadly Jeju Air Co. crash that offers more detail on the role of bird strikes in the disaster, while still leaving crucial questions unanswered.

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Jeju Air Flight 2216's deadliest crash investigation has revealed the presence of bird feathers and blood in the plane engines.According to SCMP, the South Korean officials said on Monday, January 27,

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

The exact cause of the Jeju Air crash remains unclear, and the investigation is complicated because the black boxes stopped recording four minutes before impact.