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Atlantia, the parent group of Autostrade, is controlled by the powerful Benetton family. Autostrade is under judicial investigation, along with several transport ministry officials, for culpable homicide.
A total of 74 people are accused in the legal case, which has seen investigators use a super computer to trawl through thousands of documents and files seized from Autostrade offices and the transport ministry.
The Morandi bridge has since been rebuilt, while many more of Italy's road bridges are now thought to be at risk of collapse.
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