Updated 8.45pm with company's reaction below - Italy published a report on Tuesday into road operator Autostrade per l'Italia's role in last month's deadly bridge collapse, laying out evidence that Rome is expected to use to strip the company of its concessions to run Italian motorways.

The report said Autostrade had failed to assess the safety of the Genoa bridge, where a viaduct collapsed on August 14, killing 43 people.

The government has blamed Autostrade for serious oversights and said it wants to revoke all its Italian motorway concessions.

Tuesday's report by a committee at the Transport Ministry said Autostrade had been unable to deal with issues arising from the ageing of the infrastructure it operated. It said that 98 per cent of the investment to reinforce the bridge since 1982 had been spent before Autostrade was privatised in 1999.

Autostrade, which is majority owned by Atlantia, a holding company controlled by the wealthy Benetton family, had no immediate comment.

Autostrade runs nearly 3,000 kilometres of highways in Italy and accounted for 68 per cent of its parent company's core earnings in the first half of this year.

Rome has said it does not want Autostrade to play a role in rebuilding the bridge. A judge on Tuesday ruled rebuilding of the bridge could not start for at least two months to allow experts to complete site inspections.

Autostrade rebuffs government report

Autostrade in a statement rejected the findings, saying the report had not clarified the causes of the collapse, adding that its own technicians had no access to the site for checks.

"In this context the liabilities the Committee lays at the door of Autostrade can only be considered mere hypotheses that still need to be wholly tested and demonstrated," it said.

Autostrade said that under Italian regulations such tests were not required for infrastructure located in certain seismic areas such as the one the Genoa bridge lies in.

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