The National Assembly on Thursday adopted a resolution condemning North Korea's third nuclear test.
"We strongly condemn North Korea's nuclear test, which is a serious provocative action that threatens life and safety of Korean citizens," it reads. "All the responsibilities for problems resulting from the nuclear test lie with the North."
All 185 lawmakers in attendance also urged the North "to renounce all of its nuclear programs including nuclear materials and facilities, and return to the realm of Treaty on the Non-Proliferation of Nuclear Weapons and International Atomic Energy Agency."
All parties pledged to cooperate and come up with a response.
However, the six lawmakers from the Unified Progressive Party boycotted the session. In an earlier party meeting they decided not to participate in the vote.
"We are concerned about the government and ruling party's position that only focuses on seeking further sanctions against North Korea with cooperation of the international community and military readiness," the UPP said.
Ruling Saenuri Party spokesman Lee Sang-il said, "The UPP legislators today took collective action that raises suspicions of a pro-North Korean tendency. It's hard to tell which country they represent."