R. Sandell, Social Science Department, IMDEA, Madrid, Spain


On the morning of March 11 2004 Spain woke up to a nightmare. Just three days before elections a series of ten bombs exploded on three different commuter trains in and around Madrid. 191 people were killed and 1,800 were wounded. The chaos that followed was unprecedented. After initially holding the Basque separatist organization ETA as responsible it soon dawned to the Spanish authorities as well as the general public that al-Qaeda was behind the bombings. The magnitude of the attack in combination with the fact that it represented a new threat turns it into a major dividing event. Contrary to public belief, which maintains that the terrorist attacks in Madrid did not stigmatize Muslims in Spain, I argue that the March 11 event triggered a period of increased segregation of the Arabic Muslim subpopulation. Using data from the Spanish local population register for the period 1999 to 2009. I will analyze about 4.6 million international immigration events and about 10.1 million internal migration events. The data enables me to measure change in the differential distribution of the Muslim subpopulation vis-à-vis the rest of the population, as well as change in the spatial clustering of different immigrant groups. This multiethnic approach to segregation show that the Madrid bombings consistently changed internal and international migration patterns in Spain in ways that significantly increased the Muslim population’s degree of segregation. Hence, besides terrorisms well known political ramifications my findings show that it can be a catalyst for large scale structural chang

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