At least three Serbs and a NATO soldier have reportedly been wounded in a gunfight in northern Kosovo.
Violence flared after peacekeepers tried to dismantle Serb roadblocks, near the town of Zvecan, around 60 kilometres from Pristina.
NATO troops apparently fired tear gas and small arms after their armoured vehicles were pelted with stones. Protesters are then said to have responded with handguns.
Roadblocks have been set up by Serbs in a bid to stop Kosovar and EU authorities from taking control of the border with Serbia.
Tomislav Nikolic, Serbia’s freshly inaugurated nationalist president, said again this week that he would never recognise Kosovo as an independent state – even if that means losing out on EU membership.
Kosovo declared independence from Serbia in 2008. The move has been recognised by 90 countries, including the United States and 22 of the EU’s 27 member states.