South Korea’s impeached president, Yoon Suk Yeol, has been formally arrested, days after being apprehended at his presidential compound in Seoul.

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.

The decision to arrest Yoon triggered unrest at the Seoul Western District Court, where dozens of his supporters destroyed the court’s main door and windows.