MPs had to be evacuated from the Kosovan parliament after the opposition party repeatedly let off tear gas.
Video taken at the Assembly building showed lawmakers leaving the session after the Self-Determination Movement party had used the canisters on two different occasions this morning.
They were hoping to disrupt a parliamentary vote on a border demarcation deal with Montenegro they are unhappy with.
In total two MPs from the governing coalition were injured by the gas but the Government still remained committed to carrying out the the controversial vote tonight.
The 120-seat parliament was expected to ratify the 2015 border deal, which was set as a precondition by the European Union for Kosovo’s citizens to freely travel within its visa-free travel zone known as Schengen.
The law will be approved if two-thirds of MPs support it.
But the opposition were hoping to stop this and were prepared to use extreme means.
Self-Determination Movement party leader Albin Kurti considered the vote ‘treason to the country’ because he and his supporters argued Kosovo would lose 8,200 hectares (20,000 acres) of its territory if the deal passed.
Police entered parliament after the tear gas was let off and took seven politicians to a station for questioning.
The vote has proven so toxic in the past it led to an early election after the previous government was toppled.
Prime Minister Ramush Haradinaj was confident he had enough votes to pass the deal but he will need MPs from opposition parties to secure it.