South Korea's government said on Monday it will extend the shutdown of Muan International Airport by a week to Jan. 14, citing the ongoing investigation into the crash of a Jeju Air jet that killed 179 passengers on board.

The Jeju Air 737-800 , registered as HL8088, crashed while attempting to land at Muan International on December 29. Several videos on social media showed the narrowbody aircraft attempting a belly landing on the airport’s sole runway 01/19 before it crashed into a concrete structure at the end of the runway and burst into flames.

Police in South Korea have raided the airport of Muan following a deadly plane crash on site that killed almost all passengers aboard the aircraft last weekend, the Yonhap news agency reported Monday.