South Korea’s impeached President Yoon Suk Yeol was formally arrested early on Sunday, days after being apprehended at his presidential compound in Seoul. He faces possible imprisonment over his ill-fated declaration of martial law last month.

A Seoul court issued a warrant Saturday to detain impeached President Yoon Suk Yeol for an extended period over his botched martial law bid last month in the first such detention of a sitting South Korean president.

A South Korean court extended President Yoon Suk Yeol’s detention for 20 days, igniting violent protests from his supporters. Yoon, arrested for insurrection after a failed martial law declaration, faces a tumultuous political landscape as his party’s support rebounds amid ongoing turmoil.