Immunity allegedly offered to suspected war criminal Radovan Karadzic is not valid and will not prevent his trial, the UN war crimes court has ruled.

The ex-Bosnian Serb leader faces 11 counts of war crimes, crimes against humanity and genocide.

His claim that he was offered immunity by US peace envoy Richard Holbrooke in 1996 in exchange for giving up his leadership is denied by Mr Holbrooke.