Conservative groups hold a rally near the presidential residence in Seoul calling for the nullification of President Yoon Suk Yeol's impeachment, Jan. 7. Yonhap

Hundreds of people in support of impeached President Yoon Suk Yeol and those calling for his immediate arrest rallied near the presidential residence Wednesday, a day after a court extended a warrant to detain him over his botched martial law declaration.

Some 600 supporters gathered at a road near Hangangjin Station, mostly from a conservative civic group led by pastor Jeon Kwang-hoon and Freedom Union, another conservative organization.

Holding red light sticks and waving the Korean and American flags, the supporters chanted, "Arrest Lee Jae-myung," referring to the opposition leader, and "We oppose impeachment."

The supporters claimed the detention warrant for Yoon was illegal, as the Corruption Investigation Office for High-ranking Officials (CIO), which is leading an investigation into insurrection charges related to Yoon's martial law decree, is not authorized to investigate insurrection.

A separate rally demanding Yoon's immediate arrest was held nearby, with dozens of people urging the CIO to speedily execute the warrant.

No major clashes were reported between the rallygoers, though some shouted or swore at each other beyond the safety fence separating them.

Police have stationed a midsized bus between the opposing rallies to prevent clashes.

The rallies have been held day and night, with some sleeping out in freezing temperatures. Both sides have rallies scheduled for the afternoon near the presidential residence and the Constitutional Court. (Yonhap)