South Korean anti-graft investigators asked police Monday to arrest impeached President Yoon Suk Yeol, after he fended off their week-long efforts to bring him into custody over his failed martial law bid.

The former star prosecutor has refused questioning and defiantly holed up in his residence, with a failed arrest attempt last week leaving investigators trying to extend the warrant's Monday deadline and asking for help.

Investigators from the Corruption Investigation Office (CIO) said they had asked for the police to take over because of the difficulties they had faced. Yoon's legal team has refuted the CIO's authority to arrest him.

"The validity of the warrant expires today. We plan to request an extension from the court today," said CIO deputy director Lee Jae-seung in a briefing to reporters.

He added they would consult police on the timing of the warrant extension. Police have yet to accept the request.

Last week investigators made a U-turn over safety fears following a tense, hours-long standoff with hundreds of security forces.

Yoon faces prison or, at worst,........

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