Evidence of a bird strike has reportedly been found in the Jeju Air plane that crashed into a wall at a South Korean airport, killing 179 people.

A preliminary report published on Monday, Jan. 27, said feathers and blood stains were found in both engines of the Boeing 737-800 that crashed at Muan International Airport airport on Dec. 29, according to CNN and the BBC.

The report said a flock of Baikal teal, a migratory bird commonly found in East Asia, is believed to have been involved in the crash, Fox News reported.

Additionally, the report confirmed that flight data and cockpit voice recorders stopped working prior to the crash and that the final four minutes of the recordings are missing, according to ABC News.Shortly before the end of the recording, air traffic control warned the airplane to be “cautious of bird activity,” the outlet reported. Read more below