Assistant special counsel Kim Ji-mi speaks during a regular briefing at special counsel Kwon Chang-young's office in Gwacheon, Gyeonggi Province, Monday. Yonhap

A special counsel team on Monday accused the National Intelligence Service (NIS) of actively cooperating in former President Yoon Suk Yeol's failed 2024 martial law bid.

Special counsel Kwon Chang-young's team said it has recently detected signs that the NIS prepared a list of hundreds of individuals labeled as "security threats" at the time of Yoon's martial law declaration on Dec. 3, 2024. It did not elaborate on details of the list.

"(We) have found signs that the NIS actively participated in emergency martial law," assistant special counsel Kim Ji-mi said in a press briefing.

The team is looking into who ordered creating the list, including then NIS Director Cho Tae-yong, Kim said.