PRISTINA, Kosovo – An opposition lawmaker in Kosovo used tear gas Tuesday to disrupt the work of a parliamentary commission on a border agreement with neighbouring Montenegro while activists outside hurled stones at the government offices.

The attack broke glass windows at the government offices, according to local media.

An unknown attacker also threw an explosive device at the house of the head of the state commission on the border agreement, Prime Minister Isa Mustafa said. The explosive device was found by police and no one was injured in the attack.

The opposition has been disrupting parliamentary work since last September by using tear gas canisters, blowing whistles and throwing water bottles to protest the Montenegro deal and another one with Serbia that gives more powers to ethnic Serbs in Kosovo. Street rallies by opposition supporters routinely turn into violent clashes with police.

The draft of the Montenegro border demarcation deal was approved Tuesday by the commission with support only from the governing majority members. Parliament is to vote on the proposed pact later this week.

The opposition is concerned Kosovo would lose land because of the deal and has threatened that if the government doesn’t withdraw it, “the situation will go out of control and the resistance will be harsher than ever.”

The opposition Self-Determination Movement Party confirmed that one of its members, Driton Caushi, was detained by police after he left the parliament building. Police did not immediately confirm that report.

“The government’s arrogance in insisting on ratifying the demarcation will be met by powerful resistance. Kosovo has no land to donate!” the Self-Determination Movement Party said on its Facebook page.

The government says Kosovo wouldn’t lose any land due to the deal.

Manipulation of the voting process would be dangerous “as it could revive the cycle of violence and endanger the country’s stability,” Mustafa said, apparently hinting at the Balkan wars.

The border deal has been backed by the United States and the European Union. In March three experts from the U.S., Britain and Germany approved the process of establishing the border with Montenegro and said it was in line with international standards.

In May, the European Commission recommended allowing Kosovans to travel throughout Europe’s so-called Schengen zone without visas, but only after Kosovo fulfills certain conditions, including ratifying the border agreement with Montenegro.

Kosovo declared independence from Serbia in 2008, a declaration Serbia has not recognized.

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Llazar Semini in Tirana, Albania contributed to this story.