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Serbia's prime minister has joined hundreds of people attending the funeral of a moderate Serb politician who was gunned down this week in Kosovo in an attack that fueled concerns for Balkan stability.

The mourners crammed into Belgrade's New Cemetery Thursday to pay their respects to Oliver Ivanovic, who was known as a voice of tolerance in the ethnically tense Kosovo. The 64-year-old was shot Tuesday six times by unknown assailants near his political party's offices in the ethnically-divided northern Kosovo town of Mitrovica.

Prime Minister Ana Brnabic, other officials and prominent public figures were present at the funeral service, held by the Serbian Orthodox Church.

Kosovo's stability remains shaky ten years after the predominantly ethnic-Albanian region declared independence from Serbia.