The transatlantic allies have recognised that they need to enlist the help of the global community if their counter-terrorist strategy is going to be effective. Whilst the US and Europe can enhance the security of their own homelands, nevertheless, they depend on others to create a hostile environment in which terrorism can be contained. In this spirit the American National Strategy for Combating Terrorism declared that ‘with our . . . allies we aim to establish a new international norm regarding terrorism requiring non-support, non-tolerance and active opposition to terrorists’.3 The aim has been to build on the cooperation between the US and Europe to draw other states around the world into similar patterns of behaviour. The norms of a transatlantic model of counter-terrorism are being diffused to the wider international community.