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.

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.

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.