One of the most terrifying possibilities the world faces is that al-Qa'eda, or some other Islamist group, gets hold of a nuclear bomb. Islamist terrorists are certainly trying to obtain one: Osama bin Laden has issued a document entitled 'The Nuclear Bomb of Islam', which insists it is 'the duty' of Muslims to acquire a nuclear bomb in order to use 'as much force as possible to terrorise the enemies of God'.