South Korea's presidential security chief resigns

South Korea's presidential security chief resigned Friday as he faced questioning over why his guards prevented the detention of impeached President Yoon Suk Yeol and investigators prepared to make a fresh arrest attempt.

Yoon has refused questioning and last week resisted arrest in a stand-off between his guards and investigators after his short-lived power grab on December 3 plunged South Korea into its worst political crisis in decades.

Yoon's Presidential Security Service (PSS) chief Park Chong-jun submitted his resignation on Friday morning "as he attended a police questioning", a PSS official told AFP.

It was later accepted by acting president Choi Sang-mok, an official from the interim leader's office told reporters.

It came as investigators and police prepare to mount a new bid to arrest Yoon over his martial law declaration after securing a new warrant this week.

Earlier on Friday, Park told reporters there must be no bloodshed if investigators attempt another arrest of Yoon.

"I understand many citizens are concerned about the current situation where government agencies are in conflict and confrontation," he said.

"I believe that under no circumstances should there be physical clashes or bloodshed," he added, before being questioned at the Korean National Police Agency.

Rival protest camps in sub-zero temperatures are calling for Yoon's impeachment to be declared invalid on one side, and for him to be immediately detained on the other.

Yoon would become the first sitting South Korean president to be arrested if investigators are able to detain him.

His legal team have said they will not comply with the current warrant.

The Corruption Investigation Office (CIO) said it will "prepare thoroughly" for the second arrest attempt.

Police on Friday held a meeting of its commanders to plan for the renewed effort, Yonhap news agency reported.

Park twice ignored police requests to appear for questioning over allegations of obstruction of public duty since his team blocked investigators from arresting Yoon on January 3.