A South Korean court on Sunday extended President Yoon Suk Yeol's detention for up to 20 days, leading to violent protests by hundreds of angry supporters who stormed the court building, smashed windows and broke inside.

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.

Yoon, who was impeached and suspended from office in December, is the first sitting South Korean president to be arrested.