South Korean police impose travel ban on former PM Han and ex-finance minister Choi

South Korean police have banned former Prime Minister Han Duck-soo and ex-Finance Minister Choi Sang-mok from travelling abroad as part of a probe into an alleged insurrection linked to former leader Yoon Suk Yeol's martial law bid, a police official said.

The travel ban was imposed in mid-May, the Yonhap news agency reported. Han and Choi were questioned on Monday by a special police unit investigating former top government officials over insurrection charges, Yonhap said.

After Yoon was impeached for violating the duties of his office in December, there have been questions about what role Han and Choi played in the former leader's short-lived martial law and if they had resisted the move as they claimed.

The Dec 3 martial law declaration, which was revoked hours later by parliament, thrust South Korea into an unprecedented constitutional crisis that involved both Han and Choi serving as acting president.

South Koreans vote in a snap election on Jun 3 to elect a new leader.