Earlier this month Atlantia said it would launch an audit to assess whether internal procedures were followed properly after employees at the two units were arrested over allegations that safety reports on some viaducts were falsified.

Atlantia also appointed SGS Italia, a subsidiary of SGS, to conduct an assessment of the quality and fitness of the methodological framework and procedural systems used by Autostrade and Spea, it said in a statement.

(Reporting by Giulio Piovaccari)