As the JNA disengaged in Croatia, its personnel prepared to set up a new Bosnian Serb army, as Bosnian Serbs declared the Serbian Republic of Bosnia and Herzegovina on 9 January 1992, ahead of a 29 February – 1 March 1992 referendum on the independence of Bosnia and Herzegovina. The referendum was later cited as a pretext for the Bosnian War. Bosnian Serbs set up barricades in the capital, Sarajevo, and elsewhere on 1 March, and the next day the first fatalities of the war were recorded in Sarajevo and Doboj. In the final days of March, the Bosnian Serb army started shelling Bosanski Brod, and on 4 April, Sarajevo was attacked. By the end of the year, the Bosnian Serb army—renamed the Army of Republika Srpska (VRS) after the Republika Srpska state was proclaimed—controlled about 70% of Bosnia and Herzegovina. That proportion would not change significantly over the next two years. Although the war originally pitted Bosnian Serbs against non-Serbs in the country, it evolved into a three-sided conflict by the end of the year, as the Croat–Bosniak War started. The RSK was supported to a limited extent by the Republika Srpska, which launched occasional air raids from Banja Luka and bombarded several cities in Croatia.