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.

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

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.

According to a report by Reuters, which cited sources familiar with the matter, said that investigators from the South Korean Aviation and Railway Accident Investigation Board (항공·철도사고조사위원회, ARAIB) found bird feathers and blood in both engines of the Boeing 737-800 that crashed at Muan International Airport (MWX).

South Korea has submitted an initial report on last month's Jeju Air crash to the U.N. Aviation Agency, focusing on a potential bird strike and structural factors. The Boeing 737-800 crashed during an emergency landing,

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,

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,

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.

The South Korean authorities have released a preliminary report concerning the Jeju Air accident. The incident on December 29, categorized as the most lethal aviation incident for South Korea, is still under investigation,