South Korean law enforcement officers have begun mass searches. The activities have also affected the presidential administration office.
Searches are also being conducted at the Committee of Chiefs of Staff of the Armed Forces of the Republic.
In addition, searches are taking place at the headquarters of the National Police Agency, the Metropolitan Police building and the office of the National Assembly police guard.
This was reported by the TASS agency with reference to the Chosun Ilbo newspaper.
The search warrant for the presidential administration includes the Joint Chiefs of Staff, the police commented on the events.
Earlier, Yonhap news agency reported that law enforcement officers began searching the office of the head of state, Yun Seok-yul.
These activities are carried out by representatives of a special investigative group created to investigate the martial law case.