President Yoon Suk Yeol, who has already been impeached, became South Korea’s first sitting leader to be detained after weeks of openly defying authorities.

South Korean investigators arrested impeached President Yoon Suk Yeol on Wednesday for alleged insurrection over his bid to impose martial law, after weeks of defiance and claims by Yoon and his lawyers that the arrest warrant was invalid.

Yoon was brought into custody about three hours after hundreds of law enforcement officers entered the residential compound in their second attempt to detain him.