Mourners pay their respects at a memorial altar for victims of the Jeju Air plane crash

South Korean police on Thursday raided the offices of Jeju Air and the operator of Muan International Airport as part of the probe into the fatal crash of a Boeing 737-800 plane that killed 179 people.

The flight was carrying 181 people from Thailand to South Korea on Sunday when it issued a mayday call and belly-landed before slamming into a barrier, killing everyone aboard except two flight attendants pulled from the burning wreckage.