Yoon has justified his declaration of martial law Dec. 3 as a legitimate act of governance against the liberals leading parliament who've thwarted his agenda.

More forces are expected to join the operation to take Yoon Suk Yeol in for questioning after the last attempt was foiled by his large security team.

South Korea’s anti-corruption agency says President Yoon was detained after hundreds of its investigators and police officers arrived at his presidential compound.