The two flight recorders on board a South Korean airliner stopped working before the jet crashed during an emergency landing and subsequent crash that killed 179 of the 181 people on board, officials said Saturday.

South Korean investigators previously said the flight data and cockpit voice recorders were key to finding out the cause of last month’s crash that killed 179 people

Jeju Air 7C2216 was flying from the Thai capital of Bangkok to Muan in southwestern South Korea at night when it belly-landed, overshot the runway and burst into flames after hitting an embankment. The aircraft flew every day in 2024, according to flight data reviewed by Reuters.