SEOUL - South Korea's acting president on Friday accepted resignation from presidential security chief who appeared before police for questioning over the obstruction of execution to arrest impeached President Yoon Suk-yeol.

Minister of Economy and Finance Choi Sang-mok, who became the acting president after the impeachment of Yoon and the prime minister, accepted the resignation of Park Jong-joon, chief of the Presidential Security Service (PSS), earlier in the day, according to Choi's office.

Before appearing at the National Office of Investigation (NOI) for questioning, Park submitted resignation through his secretary.

Police sent its third summons to Park earlier this week after his refusal to appear on Jan 4 and 7.

Park was booked on charges of obstructing the execution of special public affairs.

Arriving at police headquarters for questioning, Park said Yoon has been unfairly treated as a sitting leader and warned bloodshed must be avoided.

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Park, who is a former senior police official, said the current attempt to arrest a sitting president is wrong and Yoon deserved treatment "becoming of" the country's status.

"I believe there should not be any physical clash or bloodshed under any circumstances," Park told reporters, adding acting President Choi has not responded to his request for safety assurances for officials involved.

Hundreds of PSS agents blockaded the presidential compound and thwarted investigators from trying to arrest Yoon. The investigators were pulled back because of the risk of a clash.

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Officials of the Corruption Investigation Office for High-ranking Officials (CIO), which is leading the investigation, have said PSS agents were carrying firearms during the standoff although no weapons were drawn.

The investigators obtained a new arrest warrant this week after the embattled leader defied repeated summons to appear for questioning.

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On Thursday, lawyers for Yoon said the arrest warrant was illegal and invalid.

Yoon is under a separate Constitutional Court trial reviewing parliament's impeachment of the suspended leader on Dec 14 to decide whether to remove him from office permanently or reinstate him.