Former South Korean President Yoon Suk Yeol is back in custody over an independent investigation into his declaration of martial law last year.

South Korea's former president has been rearrested over last year's failed martial law bid that plunged the country into political turmoil.

The arrest warrant issued by the Seoul Central District Court sent Yoon back to a detention center near the capital, four months after his release in March, when the same court overturned his January...