Since the events of 9/11, security concerns have topped the political agendas of western governments. Given that the attacks of 9/11 were carried out by non-state agents, then the old Cold War argument that the concept of security should include non-military threats has gained currency among governments. Among the important, perceived non-military threats included in the analysis of state security is migration. According to Buzan "The threat of migration is fundamentally a question of how relative numbers interact with the absorptive and adaptive capacities of society ... The fear of being swamped by foreigners ... is easy to mobilize on the political agenda as a security issue." (People, States & Fear: The National Security Problem in International Relations, 1983).