Bosnian Serb police said Wednesday that it took control over ballots in the ethnic hotspot of Srebrenica Wednesday amid tensions over the result of Sunday's local polls.
Srebrenica is a mostly Muslim Bosniak town in the Serb part of Bosnia-Herzegovina, the Srpska Republic.
Tensions grew after election authorities ordered a recount of ballots following the declaration of victory by a Serb candidate for mayor over the incumbent Bosniak.
The result could still swing either way, with thousands of absentee ballots still in play.
Serb forces carried out a genocide on the town's Muslims in 1995, killing around 8,000 men and boys and driving the rest of the population out.
More than 20 years since the war, the three main ethnic groups in Bosnia - Bosniaks, Serbs and Catholic Croats - are still mutually mistrustful and resist the reforms the European Union requires for the country's progress toward membership.