South Korean prosecutors have opened an investigation into President Yoon Suk Yeol, his interior minister, and the now-former defence minister over their roles in an attempt to impose martial law, Yonhap news agency reported on Thursday.
Kim Yong-hyun, who resigned as South Korean defence minister over his involvement in Tuesday's martial law order, also faces a travel ban as prosecutors investigate, Yonhap said. The other two do not face such bans.
Citing unspecified threats from "anti-state forces" and obstructionist political opponents, Yoon imposed martial law for about six hours before reversing course after parliament voted to oppose the move.
Yoon now faces an impeachment vote on Saturday.

Several people detained in India's Gen Z-led protests against voter roll changes
Trump shares Republican senator's phone number in feud over time switch
Saudi Arabia says shrapnel from intercepted ballistic missile in Asir injures one
Israeli strike kills five in Gaza, health officials say
Nine injured in Australia as car crashes into crowd north of Sydney
India's 'cockroach' youth party to protest, demand poll chief's resignation
Congo's Ebola outbreak has killed more than 4,000, government data shows
About 400 French schools closed as some student protests turn violent
