Lawyers for the former Bosnian Serb leader Radovan Karadzic have filed papers arguing all charges against him should be dropped.

They say US diplomat Richard Holbrooke promised him immunity from prosecution on condition he gave up politics - something Mr Holbrooke strongly denies.

Mr Karadzic is on trial at the UN tribunal in The Hague, facing 11 charges including genocide.

The tribunal has said that any immunity deal would not be binding.