Local Serbs are maintaining blockades of two bridges in the city of Mitrovica, in the north of Kosovo.
Overnight, rival groups of young Serbs and Kosovar Albanians threw rocks at each other on a blocked bridge over the Ibar River, which divides the city's two communities.
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No casualties were reported.
Tensions in the area have risen amid Pristina's efforts to exert control over two border crossings with Serbia.
Kosovo police and customs officials together with EU police deployed to the crossings on September 16.
A previous attempt by Kosovo authorities in July to take control of the crossings left one Kosovo policeman dead.
compiled from agency reports