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.

South Korea’s anti-graft agency will seek to extend an arrest warrant for President Yoon Suk Yeol, as pressure mounted on law enforcement to resolve the country’s escalating political crisis.

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.