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,

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

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

By Jack Kim and Lisa Barrington SEOUL (Reuters) -Both engines of the Jeju Air plane that crashed last month contained duck remains, according to a preliminary report on Monday, with authorities still trying to determine what caused the deadliest air disaster on South Korean soil.

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.

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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.