Nightly protests calling for justice for a man allegedly raped and murdered by police in the Republic of Srpska are threatening to topple the government amid claims Western powers have allowed post-war Bosnia to be "privatised" by a corrupt elite.

At 7:30 every evening, Davor Dragicevic bows his head, raises his fist, and shouts three words across the neat and tidy central square of Banja Luka.

And every evening, his cry is echoed by several hundred supporters in a furious chant: “Justice for David!”

Mr Dragicevic has been leading rallies in Banja Luka, the capital of Republic of Srpska, the Bosnian Serb mini-state that makes up one half of Bosnia, since his son’s battered body was found in a drainage ditch here in March.