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.
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.
Kosovo authorities said Marko Djuric, the head of the Serbian government office on Kosovo, entered the town of Mitrovica without authorisation.
The prominent politician was close to his party office in the northern town of Mitrovica where he was shot at least five times.
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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