He was apparently referring to the bridge's concession-holder, Italian motorway firm Autostrade, a unit of Atlantia group.
Autostrade insisted that the bridge had been "constantly monitored" and refuted accusations that it had not invested enough in maintenance.
Rescuers inspect the rubble and wreckages by the Morandi motorway bridge after a section collapsed earlier in Genoa on August 14, 2018.
"We also don't know the capacity of each vehicle", Gissi said.
Returning to the scene for the first time since the collapse, limping truck driver Luciano Goccia said he is alive thanks to a miracle after being blown backwards several metres as he passed under the motorway bridge.
The Italian CNR civil engineering society said structures dating from when the Morandi Bridge was built had surpassed their lifespan. The ceremony will be presided over by Cardinal Angelo Bagnasco, the Genoa archbishop.More news: Kevin De Bruyne 'Suffers Knee Injury' In Manchester City Training
"We're now at 38 confirmed deaths and some people missing", Deputy Prime Minister and Interior Minister Matteo Salvini told reporters on the sidelines of an event in the southern region of Calabria.
One of the most compelling testimonies came from Davide Capello, 33, a former goalkeeper for Serie A side Cagliari.
Italian news agency Ansa quoted a bystander, Pietro M, as saying he saw "lightning strike the bridge" just before the collapse.
Italy's anti-establishment government, outraged at the deadly collapse of a 50-year-old bridge, has presented the disaster as a warning to Brussels to give it more leeway to upgrade the country's ageing infrastructure.
Pope Francis also sent his condolences to the victims, saying the tragedy has "caused desperation among the population", at a service for the feast of the Assumption.
Italian Prime Minister Giuseppe Conte today declared a year-long state of emergency for the region of Liguria after the bridge disaster that killed 39.
It has been riddled with structural problems since its construction, which has led to expensive maintenance and severe criticism from engineering experts.More news: Serena Williams, Nike and Virgil Abloh Collaborate on New Collection
On Tuesday engineering website "Ingegneri.info" called it "a tragedy waiting to happen".
One factory, immediately next to one of the viaduct's support columns, was virtually empty on Tuesday on the eve of a national holiday, and seems to have sustained minimal damage. "Obviously for me, it is not", he said. I heard a roar.
Authorities urged the quick removal of tons of debris from a dry river bed so that the rubble doesn't create a makeshift dam if heavy rains fall in the flood-prone city on the Mediterranean.
Italy's transport minister has now called on senior managers at the company which operated the motorway bridge to resign.
Genoa Mayor Marco Bucci told CNN the bridge collapse was "not absolutely unexpected". "We will have to assess what could have happened", Marigliani continued.
Details have begun to emerge in Italian media about those who died - workers on their way to clock in, vacationing families and foreign tourists.
Morandi was an "engineer with great insight, but lacking in practical calculations", Mr Brencich told the Corriere della Sera.More news: Keith Hernandez supports drilling Acuna: 'You've got to hit him'
He said he didn't know who might be responsible, but added: "It wasn't an accident". "I used to enjoy passing over the bridge as a child, it was a novelty".