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 ...

The two black boxes on the Boeing jet involved in the worst aviation disaster on South Korean soil stopped recording about four minutes before the accident, the transport ministry said on 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.

The transportation ministry said it wasn’t immediately clear why the devices failed to record data in the last four minutes.

SEOUL, South Korea — The black boxes ... After analyzing the devices, the U.S. National Transportation Safety Board concluded that both the flight data and cockpit voice recorders stopped ...