The prosecution has begun investigating the military's controversial martial law plans drafted in 2017.
The Seoul Central District Prosecutors' Office said Wednesday that the case was assigned to a public safety department, which is conducting a legal review of the case.
A civic group filed a complaint against the former and incumbent heads of the Defense Security Command(DSC) for the unit's contingency plan to quell the 2017 anti-government candlelight protests.
The counterintelligence military unit was accused of plotting to commit treason.
A separate independent team of investigators is soon expected to launch its own probe after President Moon Jae-in ordered it to get to the bottom of the allegations on Tuesday.
[Photo : YONHAP News]