Some 18 investigators arrived at the presidential compound at around 11:50 a.m. with a search warrant to seize documents and other records which could provide a clue about Yoon's short-lived martial law debacle last Tuesday.
But they were prevented from entering by security staff, who, citing procedural issues, demanded prior consultation, leading to an hours-long standoff.
The delay in the raid raises concerns over destroying or tampering of evidence.
The warrant states Yoon as a suspect, permitting the search and seizure of the presidential office, meeting rooms, and other facilities. However, the president's residence in Hannam-dong is not included.
About 60 law enforcement officials also raided other key locations linked to the Dec. 3 debacle, including the National Police Agency and the Seoul Metropolitan Police Agency.
The raid came after NPA chief Cho Ji-ho and SMPA chief Kim Bong-sik were arrested earlier in the day.
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