Contracts worth €2 billion.
Rome's public transport company ATAC awarded the vast majority of its service and supply contracts from 2010-2015 without due legal process. It is also suspected that contracts were signed in return for bribes.
The findings are contained in a report by ANAC, Italy's anti-corruption authority, headed by Raffaele Cantone.
The outgoing councillor for Rome's tranport, Stefano Esposito, has handed the findings of the ANAC report to Rome's public prosecutors' office.