In a blow to Serbia, which hoped a peaceful election would further its EU ambitions, voting was interrupted late Sunday in the northern town of Kosovska Mitrovica after Serb extremists stormed a polling station and destroyed ballot boxes.
"Only after we assess the electoral material, whether it is damaged or not, will we be able to see ... If the vote should be repeated," Valdete Daka, head of the central electoral commission, told reporters.
The EU's foreign policy supremo Catherine Ashton said she would host a meeting tomorrow with the leaders of Kosovo and Serbia to discuss the violence that marred the election.
She "strongly" condemned the violence that took place, stressing that "all voters have the right to participate in elections in a safe and secure environment, free of violence."
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Ashton called for an investigation "without delay" into the violence.
The violence was "an attack on the fundamental right of the people to express their wishes through the ballot box," added Gualtieri.
Sunday's vote was the first Serbia has backed since Kosovo unilaterally proclaimed independence from Belgrade in 2008.
Some 120,000 ethnic Serbs live in Kosovo, whose 1.8 million population is mostly Albanian. Some 40,000 of them live in the north, where they make up the majority and enjoy control over some public institutions.