South Korea's impeached President Yoon Suk Yeol refused on Monday to be questioned by investigators under a probe into whether he committed insurrection, as dozens of his supporters faced arrest over a violent rampage on a court building.

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

A South Korean court on Sunday extended President Yoon Suk Yeol’s detention for up to 20 days, citing concern he could destroy evidence in a criminal probe into his short-lived declaration of martial law in early December.