At South Korea's National Assembly, tensions are building over moves to give fast-track status to certain key bills.
Four parties, without the main opposition Liberty Korea Party -- say they're going to fast-track bills on electoral reform and on creating an independent body to investigate corruption among high-ranking government and public officials.
They planned to do that on Thursday, but the Assembly descended into chaos after a physical standoff.
The Liberty Korea Party -- which is blocking the conference rooms for the meetings -- said electoral reform requires bipartisan agreement, and claimed the four parties were using illegal means get the bills fast-tracked.
The ruling Democratic Party condemned the conservative party for "illegal violence," saying they will sue those involved.
It was the worst violence seen since the parliamentary act was amended in 2012 to outlaw physical violence that had long been prevalent.
The ruling party has called on the Liberty Korea Party to return to its senses, but the conservatives have pledged to keep resisting until the fast-track move is scrapped.