The presidential security service guards including military troops shielded Yoon from investigators in a six-hour standoff.
Park was again being questioned on Saturday while acting PSS chief Kim Seong-hun refused to turn up to a third summons, opening him up to possible arrest.
“Kim Seong-hun… cannot leave his post for even a moment regarding presidential security matters,” the PSS said in a statement.
Kim, who is considered to be more of a hardliner than his predecessor Park, is expected to lead efforts to prevent the execution of the second arrest warrant, if he avoids being arrested.
Lee Jin-ha, the PSS head of security and safety, also appeared for police questioning on Saturday.
Far-right youth
The CIO said it will “prepare thoroughly” for its second attempt to arrest Yoon and warned that anyone obstructing them could be detained.
The National Office of Investigation, a police unit, sent a note to high-ranking police officials in Seoul requesting they prepare to mobilise 1,000 investigators for the fresh attempt, Yonhap news agency reported.
