The Corruption Investigation Office for High-ranking Officials (CIO) announced on Thursday that it has transferred President Yoon Suk-yeol’s case to the Seoul Central District Prosecutors’ Office and formally requested his indictment on charges of leading an insurrection and abuse of power. The CIO alleges that Yoon conspired with former military officials to declare martial law on Dec. 3, to exclude state authority and disrupt constitutional order. Despite issuing three subpoenas, the CIO conducted only one 10-hour interrogation during Yoon’s detention, as the president repeatedly refused to cooperate, arguing that the CIO lacks legal authority to investigate such charges.

Yoon, who was arrested on Jan. 15, exercised his right to remain silent throughout the investigation and declined to sign interrogation records. The case transfer follows mounting criticism of the CIO’s handling of the investigation, with legal experts and the opposition questioning its ability to deliver credible results.