The black box of a Jeju Air aircraft behind the fatal accident on Dec. 29 stopped recording when the plane was approximately 2 kilometers from the runway at Muan International Airport, according to a preliminary report.

Black box silence adds mystery to the Jeju Air crash killing 179. A report reveals a bird strike just before the deadly accident.

The absence of a transcript of the final moments leaves the investigation without crucial clues that would likely have shed more light on what caused the catastrophe. On-the-ground footage of the jet before landing suggests that one engine may have flamed out after a bird strike, but the condition of the second one isn’t known.

Seoul: The South Korean transport ministry on Saturday has revealed that the ill-fated Jeju Air flight, involved in last month’s deadly crash, received a warning from air traffic control about potential bird activity just one minute before its black box recording stopped.

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

Korean authorities investigating the tragic Jeju Air crash last month released a preliminary accident report Monday, revealing that the aircraft's black box stopped recording approximately 2 kilometers before the plane approached the runway.

The preliminary report was released by the Aviation and Railway Accident Investigation Board on Monday in South Korea.