Worldwide, vulnerable neighbourhoods of large cities are often the scene of collective violent conflicts linked with migration and ethnic minorities’ struggles for social justice. However, urban conflicts of this kind have not taken place in Spanish cities with high immigration rates, even though the country has been deeply affected by two recent socioeconomic crises (2009 and 2020). This article reports findings of a study aimed at understanding what lies behind this apparent social peace. The research methodology was based on an (...) analysis of secondary socio-economic and socio-relational data from the Spanish Institute of Statistics and from key national surveys and reports. Results confirmed that immigrant population living in the country are strongly segregated in the lower strata of the labour and socioeconomic structure and have been disproportionately affected by the crises. However, research findings also pointed to the existence of strong closed support networks where social capital has been effective at palliating members’ disadvantage and unrest. Drawing on the Theory of Rupture Frames, we argue that this is a fragile and unsustainable social peace, rooted in social injustice, and anticipate that unless actively prevented, uncontrolled conflict will eventually emerge in main cities’ neighbourhoods in Spain. (shrink)