Former South Korean President Yoon Suk Yeol returned to jail on Thursday after a court approved a warrant sought by prosecutors investigating his attempt to impose martial law last year. The Seoul Cen

Former President Yoon Suk Yeol, already ​accused of insurrection, faced additional ​criminal charges after a special counsel expanded the investigation into his ill-fated declaration of martial law.

Yoon, who was the first sitting South Korean president to be arrested, faces trial on charges of leading an insurrection over his attempt to impose martial law. During Wednesday's seven-hour hearing, a special counsel team argued for the arrest warrant on five key charges, South Korean news agency Yonhap reported.