Yoon’s arrest could mark the beginning of a prolonged period in custody, lasting months or longer, as he faces the possibility of imprisonment on potential rebellion charges linked to his imposition of martial law on Dec.

South Korea’s impeached president, Yoon Suk Yeol, has been formally arrested, days after being apprehended at his presidential compound in Seoul.

Yoon became the first sitting South Korean president to be arrested. South Korean investigators probing Yoon for alleged insurrection asked a Seoul court on Friday to extend his detention after he refused to be questioned.