The plane crash is the first major test for South Korea’s acting president, Choi Sang-mok, who was appointed the interim leader only on Friday, as the country grapples with a political crisis at the highest levels.

South Korea's suspended president Yoon Suk Yeol remains defiant in his newly-fortified residence, as investigators seek to extend the arrest warrant over his short-lived martial law order. The current warrant - which was due to expire at midnight local time (15:00 GMT) - was issued after Yoon ignored multiple summonses to appear for questioning on insurrection and abuse of power charges.