This article reflects on the events of 11th September, 2001, in their immediate aftermath. Globalisation has brought economic interdependence without institutions for global distributive justice. The challenge for social policy of greater mobility of people, both within and between states, is as pressing as the problems of security highlighted by those events. These issues will demand attention long after the ‘war against terrorism’ has abated, because rich First World countries can no longer insulate themselves from the effects of poverty and injustice in the developing world.