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.

South Korea's transport ministry announced that the crashed Jeju Air flight's flight data and cockpit recorders stopped recording four minutes prior to the crash and will analyze

After analyzing the devices, the U.S. National Transportation Safety Board concluded​ that both the flight data and cockpit voice recorders stopped working about four minutes before the crash.