Firefighters check near the wreckage of a passenger plane at Muan International Airport on Sunday in Muan-gun, South Korea. A plane carrying 181 people, Jeju Air Flight 7C2216, skidded off the airport’s runway and collided with a wall, resulting in an explosion and killing 179. (Chung Sung-Jun)

Flight recorders from the passenger jet that crashed in South Korea last month, killing more than 170 people, stopped working minutes before the plane belly-landed and exploded on the runway, investigators said Saturday.