The black boxes of a Boeing jetliner that crashed in South Korea last month stopped recording about four minutes before the accident, South Korean officials said Saturday, possibly complicating investigations into the cause of the disaster that killed 179 people.

Bird feathers have been found in an engine recovered from the site of the deadly Jeju Air flight which crashed-landedand killed 179 people in South Korea, investigators said. The Boeing 737 -800 skidded off a runway at Muan International Airport and hit a concrete fence, bursting into flames, on 29 December.

The flight data and cockpit voice recorders on the Jeju Air jet that crashed on Dec. 29 stopped recording four minutes before the airliner hit a concrete structure at South Korea's Muan airport, the transport ministry said on Saturday.