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.

South Korean investigators said Saturday they were close to finalising the transcript of the cockpit voice recorder from a fatal plane crash that left 179 people dead last week."The transcript of the cockpit voice recorder (CVR) is expected to be completed today,

Authorities also raided the regional aviation office in Muan, part of Busan’s aviation administration. Read also: Black box data recovered in South Korea’s deadliest plane crash; another sent to U.S.