This photo shows the entrance of the Corruption Investigation Office for High-ranking Officials in Gwacheon, Gyeonggi Province, Jan. 19. Yonhap

A state anti-corruption investigation body probing impeached President Yoon Suk Yeok over his failed martial law bid said Sunday it will request Yoon to appear for questioning early this week after the detained president did not show up for questioning earlier in the day.

The move by the Corruption Investigation Office for High-ranking Officials (CIO) came as Yoon, who was formally arrested earlier in the day after the Seoul Western District Court granted the arrest warrant, defied the CIO's request to appear for questioning on Sunday.

Officials at the CIO said they would again request Yoon to appear for questioning at 10:00 a.m. Monday.

Citing risks of destroying evidence, a judge at the Seoul Western District Court granted the warrant on charges that Yoon led an insurrection and abused his power when he declared martial law on Dec. 3 and allegedly sent troops to the National Assembly to stop lawmakers from voting down the decree.

With the warrant's issuance, investigators can keep Yoon in custody for up to 20 days, including the days he has already spent at a detention center following his apprehension at his residence in Seoul last Wednesday.

The CIO said Yoon "appears to deny the rule of law" without any effort to "resolve the issue within the judicial system."

"If he can't accept the warrant issuance, he can follow the appeal or remedy process to overturn it within the judicial system," it added.

The agency also noted the need for safety measures for investigators, as protesters stormed the court in protest against the warrant issuance, threatening police and law enforcement officers.

In a letter written from the detention center, Yoon urged his supporters who stormed into a court in anger over the decision to formally arrest him to express their opinion using "peaceful means," although he understands their "resentment and anger."

Yoon's lawyers, who delivered his remarks in a notice to the press, said the president was "astonished" and "sorry" after hearing of the violence that erupted at the Seoul Western District Court early Sunday. (Yonhap)