Police said in a statement today that Elvis Pista, a flamboyant politician recognisable for his spiked hair, was shot four times at close range shortly after midnight in the western town of Orahovac, his hometown. Authorities believe a handgun with a silencer was used.
Police did not discuss possible motives behind the attack but the slaying comes amid heightened tensions between political rivals after Kosovo's June 8 parliamentary election.
The final results were not in from Pista's race but preliminary results showed him leading.
In Orahovac, hundreds gathered Sunday to pay their respects.
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Thaci, who called Pista "an associate and a friend," condemned the killing and urged police to swiftly find who was responsible. Kosovo President Atifete Jahjaga also condemned the shooting, saying it threatened the rule of law in Kosovo.
Past elections in Kosovo were often marred by irregularities and violence between rival groups but no incidents were reported in the June 8 poll, the second such vote since Kosovo seceded from Serbia in 2008.