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.

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.

South Korea's authorities investigating last month's Jeju Air plane crash have submitted a preliminary accident report to the U.N. aviation agency and to the authorities of the United States, France and Thailand,

SEOUL: Investigators have found evidence of a bird strike in the crash of a Jeju Air passenger plane in South Korea in December, which resulted in 179 fatalities.Feathers and blood stains discover

The fire broke out in the back of the cabin, officials said. All 176 people on board, including passengers and crew members, were evacuated, some with minor injuries.

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SEOUL, Jan 27 — Bird feathers and bloodstains were found in both engines of the Jeju Air plane that crashed in December, according to a preliminary investigation released 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.