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.

Prosecutors indicted detained South Korean President Yoon Suk Yeol on Sunday on charges of leading an insurrection with his short-lived imposition of martial law last month.