The purpose of this contribution is to analyze spatial segregation of different groups of foreign immigrants in the city of Naples. We distinguish between two sources of spatial segregation. One source is mostly economically induced, and it is ascribed to within-city inhomogeneity in the price of residential property, and the availability of jobs. The second source is spatial attraction, i.e., newly arrived minority migrants may benefit of positive spillovers in settling close to their compatriots and transnational social networks play an important role in channeling arriving migrants into specific neighborhoods and, also, into particular occupations. We aim at assessing how much segregation may be ascribed to each of the two sources of spatial segregation. To do this, we apply a version of the K-function specially conceived for assessing spatial attraction while adjusting for the effects of spatial inhomogeneity. To avoid the risk of confounding the two sources of clustering, spatial inhomogeneity is estimated following a case-control approach.