It's the first war crimes case referred to a Serb court from the United Nations war crimes tribunal in The Hague, Netherlands.
The six men on trial are accused of committing atrocities against Muslim civilians in 1992 in the ethnically mixed border area of Zvornik in northeastern Bosnia.
The Zvornik case is seen as a test of the Serb judiciary's ability to handle war crimes cases at home.
(AP)