Yonhap news agency says South Korean prosecutors have indicted the impeached President Yoon Suk Yeol over his imposition of martial law.

South Korean prosecutors charged President Yoon Suk Yeol for his failed attempt last month to place the country under martial law, forcing the impeached leader to remain in detention as they build a case against him.

The charges are unprecedented for a South Korean president, and if convicted, Yoon Suk Yeol could face years in prison for his shock martial-law decree, which sought to ban political and parliamentary activity and control the media.