The UN Mission in Kosovo (UNMIK) worker was arrested for reportedly allowing his official car to be used by Kosovo-Serbs erecting a roadblock. The latest flare-up has led to calls for UNMIK to leave the country.
Serbia's President Aleksandar Vucic says troops ready to act as Kosovo police continue operation against suspected organised crime in the predominantly Serb north.
Kosovo passed laws to build an army, asserting its statehood in a US-backed move that prompted outrage in Serbia, which does not recognise its former province's independence.
Kosovo's parliament has approved the formation of an army, a move that has angered Serbia which says it would threaten peace in the war-scarred region.
Kosovo's Parliament is set to vote December 14 on transforming the country's security forces into a regular army amid opposition from Serbia.
Kosovo parliament passes bills laying the groundwork for creating Kosovo's own army but Serbia says the decision will have "unforeseeable consequences" for the security in the region.
With the West in disarray, Kosovo is finding out that its territorial integrity is up for grabs.
A land swap deal floated by the two countries would allow Serbia to keep control over northern parts of Kosovo that are mainly populated by Serbs. In return, Belgrade would hand southern municipalities mainly populated by ethnic Albanians to Kosovo.
The idea to make predominantly ethnic Albanian towns in Serbia part of Kosovo in exchange for Serbia taking over a part of northern Kosovo populated mainly by Serbs divides the Balkans.
The marchers called to attention over 13,500 people who were killed or went missing during the 1998-1999 Kosovo war many of whom who have not been found
Kosovo police used tear gas to disperse Serbs who set up a road block a day after Serbian official Marko Djuric was briefly detained in the city of Mitrovica.
A Serbian passenger train that departed from the country's capital Belgrade for Mitrovica, a disputed city in the youngest country in the Balkans, Kosovo, has escalated tensions in the region again.
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