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.

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

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 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.

Bird feathers and bloodstains were found in both engines of the Jeju Air plane that crashed in December, according to a preliminary investigation released on Monday. The Boeing 737-800 was flying from Thailand to Muan in South Korea on December 29 when it crash-landed and exploded into a fireball after slamming into a concrete barrier.

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,

Preliminary report confirms bird strikes in engines of crashed Jeju Air plane, investigation ongoing for cause.

Feathers and blood stains belonging to the Baikal teal were found on both engines of the crashed Jeju Air plane Investigators say they have found evidence of a bird strike on a passenger plane that crashed in South Korea in December,