The Bijeljina massacre involved the killing of civilians by Serb paramilitary groups in Bijeljina on 1–2 April 1992 during the dawn of the Bosnian War. The majority of those killed were Bosniaks (or Bosnian Muslims). Members of other ethnicities were also killed, such as Serbs deemed disloyal by the local authorities. The killing was committed by a local paramilitary group known as Mirko's Chetniks and by the Serb Volunteer Guard (SDG, also known as Arkan's Tigers), a Serbia-based paramilitary group led by Željko Ražnatović (aka Arkan). The SDG were under the command of the Yugoslav People's Army (JNA), which was controlled by Serbian President Slobodan Milošević.