South Korean police raided Muan airport following a deadly plane crash at the site that killed nearly all passengers on board the plane last weekend, Yonhap news agency reported Monday.
The office of low-cost airline Jeju Air, which operated the crashed Boeing 737-800, was also investigated as part of a warrant based on allegations of negligence resulting in death, according to the report.
Police have also barred Jeju Air boss Kim E Bae from leaving the country, as they consider him a key witness in the case, Yonhap reported separately.
A total of 179 people were killed when the Boeing 737-800 skidded on the runway at Muan airport in southwestern South Korea without its landing gear, eventually crashing a -into a concrete wall and going up in flames.
Two crew members survived the crash.
The plane's pilots had called a bird strike just before the crash.
But it is not clear how the crash could affect the landing gear of the plane.
Apart from two Thai nationals, all on board the plane, which was on its way from Bangkok to Muan, were Korean citizens.
Korean investigators are at the scene to find the cause of the crash, supported by US investigators and representatives of US aircraft manufacturer Boeing.
The plane's flight recorders have since been recovered and data from the cockpit voice recorder has been transferred.
The second one registered was damaged in the crash and is to be further investigated in the US.
Questions have also been raised about the concrete barrier at the end of the runway that protects a system that helps pilots land, with some experts saying it was unnecessary and may he made the accident worse.
South Korean authorities have also launched an investigation into Boeing 737-800 aircraft used by domestic airlines.