Another example for securitized sectors are immigration and refugee issues in the United States and in Europe. Concerns of terrorist infiltration are regularly cited as grounds for the tight control of borders. Because it is easier to securitize an issue following the September 11 attacks, this concern for safety and security has taken attention away from the economic factors that have always been at play in international migration. In addition, also in migrants' countries of origin, diaspora, emigration, and citizenship issues can be securitized.