Following Rosario Central’s elimination from the Copa Sudamericana by Corinthians in Brazil, clashes erupted between Argentine fans and the São Paulo Military Police at Neo Química Arena. The confrontation resulted in the detention of nine individuals – four Brazilian nationals and five Rosario Central supporters. Details regarding the cause of the initial conflict remain unclear, but the incident underscores ongoing concerns about fan violence in South American football. Authorities responded to the unrest with force, leading to the arrests and further escalating tensions. The event has prompted investigations into the actions of both the fans and the police forces involved. This incident casts a shadow over the competition and raises questions about security measures at future matches.