South Korea's parliament ratified a long-stalled free trade deal with the United States on Tuesday after ruling party lawmakers forced a vote amid shouts and shoves from opposition rivals.

Shouts filled the National Assembly as lawmakers pushed, shoved and screamed while ruling party lawmakers forced their way onto the parliamentary floor. One opposition lawmaker fired tear gas, reports said. Some lawmakers were seen wiping their eyes after being doused with the chemical.

South Korean lawmakers voted 151 to 7 in favor of ratifying the landmark trade agreement in a surprise legislative session called by the ruling Grand National Party, parliamentary officials said.

A key sticking point was a provision that opponents say would allow investors to take disputes falling under the agreement's jurisdiction to a U.S.-influenced international arbitration panel. The opposition