By Hyunsu Yim and Ju-min Park SEOUL (Reuters) -South Korean investigators will seek an extension of a warrant to arrest impeached President Yoon Suk Yeol, as visiting U.S. Secretary of State Antony Blinken reaffirmed confidence in the key Asian ally's handling of the political turmoil.

Hundreds of South Koreans, bundled up against freezing temperatures and snow, rallied overnight into Sunday near the residence of impeached President Yoon Suk Yeol as authorities prepared to renew their efforts to detain him over his short-lived martial law decree.

Protesters in South Korea are calling for President Yoon Suk Yeol to be arrested as a warrant expires at midnight on Monday. The chief of security for Yoon, Park Chong-jun, said Sunday he could