A probe into the top South Korean military intelligence commander's alleged involvement in martial law operations has been transferred to the military prosecution, the state anti-corruption investigation office said on Thursday.

South Korea's suspended President Yoon Suk Yeol did not respond on Wednesday to a second summons by anti-corruption authorities who, along with prosecutors, are investigating his short-lived martial law decree issued early this month.

South Korean President Yoon Suk Yeol, struggling amid low approval ratings, accused the opposition-held parliament of blocking government actions.