Wednesday’s dramatic arrest saw a hundreds-strong force of police and investigators bypass bus barricades, cut barbed wire and scale ladders to get inside the compound where Yoon was surrounded by hundreds of guards.
Yoon said he complied with investigators to avoid “bloodshed” but did not accept the legality of the investigation.
Meanwhile, officials were trying to secure a new warrant that could hold him for longer than 48 hours.
If investigators successfully obtain that warrant, they are expected to be given a 20-day extension to the leader’s detention to allow time to formalise an indictment against him.
South Korea’s opposition Democratic Party celebrated Yoon’s detention, while the parliament speaker said it was time to stabilise the country after weeks of turmoil.
But Yoon’s lawyers have filed for a review of the warrant used to arrest him.
A hearing to review the warrant’s legality was set for 5pm local time at a Seoul court Thursday.
Experts say Yoon’s legal team appeared to be trying to drag out the arrest process to his benefit.
“It appears that every legal tactic is being employed by Yoon’s team to prolong the situation,” Lee Jong-soo, a law professor at Yonsei University, told AFP.
