Bosnian Muslims "planted corpses", exaggerated death tolls and shot or shelled their own people as part of a dirty tricks campaign against the Serbs, Radovan Karadzic claimed on Tuesday.

The wartime Bosnian Serb leader used his second day in the dock of a United Nations tribunal to pour scorn on allegations of genocide and war crimes for which he has been indicted on 11 counts.

Karadzic, 64, insisted that the Serbs could not be held accountable for the four-year siege of Sarajevo, where 12,000 died from shelling and sniper fire, because the atrocities were a "cunning strategy" by Bosnian Muslims "aimed at bringing in foreign troops and foreign intervention".