Lawmaker Kim Sun-dong (bottom) of the Democratic Labour Party detonates a tear gas canister towards the chairman's seat at the National Assembly, to try to stop the ruling Grand National Party's move to ratify a bill on a free trade agreement with the United States, in Seoul in this still image taken from video Nov 22, 2011. South Korea's ruling conservatives rammed a controversial free trade deal with the United States through parliament on Tuesday as legislators scuffled and one opposition MP let off a tear gas device, briefly clearing the chamber. [Photo/Agencies] 

Lawmaker Kim Sun-dong (C) of the Democratic Labour Party struggles with security guards after he detonated a tear gas canister towards the chairman's seat, to try to stop the ruling Grand National Party's move to ratify a bill on a free trade agreement with the US, at the National Assembly in Seoul Nov 22, 2011. [Photo/Agencies]