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.

South Korean officials are launching an investigation into the cause of the fire that engulfed an Air Busan passenger plane, with eyewitness accounts suggesting a power bank may have sparked the blaze.

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

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,

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.

STORY: South Korea has released the initial findings of a probe into the crash of a Jeju Air flight last month. But mysteries remain. All 175 passengers and four of six crew were killed in the incident,

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.

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

Investigators found bird blood and feathers in both engines of the Jeju Air Boeing 737 that crashed in Seoul, killing 179 people.