South Korea's former defense minister was taken into custody early Sunday for his role in last week's martial law declaration, which plunged the country into a deepening political crisis.
Kim Yong-hyun had already resigned after the short-lived martial law declaration by President Yoon Suk-yeol, which was lifted within hours after parliament voted it down, Seoul-based Yonhap News reported.
Kim had already faced a travel ban.
A police investigation has already been launched into Yoon and others for alleged insurrection.
The latest move came a day after Yoon survived an impeachment motion in parliament.
Six opposition parties submitted the motion, which required a threshold of 200 votes in the 300-member parliament to pass, but a near-total boycott by Yoon's People Power Party (PPP) saved the embattled president, although his political future is uncertain.
The opposition plans to propose another impeachment motion this week.
