Supporters of impeached President Yoon Suk Yeol smashed windows and stormed into a court early Sunday moments after it had extended his detention for questioning on charges of insurrection over his declaration of martial law in December.

South Korean President Yoon Suk Yeol has been detained after a massive law enforcement operation at the presidential compound that ended a weeks-long stand-off between his bodyguards and the country’s anti-corruption agency.

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.