The Korean prosecution service logo is seen on a door at the Seoul Central District Prosecutors' Office in Seoul's Seocho District, Wednesday. Yonhap

The ruling Democratic Party of (DPK) on Thursday proposed a bill at a parliamentary plenary meeting that would strip the prosecution of its direct investigative powers, prompting the main opposition party to launch a filibuster.

After the amendment to the Criminal Procedure Act was brought before the session, lawmakers of the main opposition People Power Party (PPP) began the filibuster in an attempt to block the bill.

If approved, the revision would strip the prosecution of its authority to conduct direct investigations, including supplementary investigations.

The DP has been pushing ahead with prosecution reform legislation that calls for dismantling the prosecution and creating two new agencies, each tasked with handling investigations and indictments.