Two instructors at the Más Preparación test-prep academy in Mexico City were detained by the Fiscalía General de Justicia de la Ciudad de México on Friday for allegedly collecting fees from applicants to sit the UNAM online entrance exam in their place, El Economista reports.

The FGJ-CDMX announced it had obtained a process link against the two men, identified only as David 'N' and Edgar 'N'. That judicial step, which formalises criminal proceedings, came after investigators found the pair had charged applicants to take the exam on their behalf.

El Universal reports that Más Preparación shut every one of its branches following the detentions. The closures cut off enrolled students mid-course, and parents and guardians are now threatening to file criminal complaints against the institution for failing to complete the sessions they had paid for.

The read here is that the closures leave families with two grievances at once: money paid for prep sessions that were never finished, and a deeper question about how far the fraud inside the academy extended. The FGJ-CDMX has not, on the available record, said whether the investigation reaches beyond the two detained instructors.