The collapse in Genoa occurred during a torrential rainstorm and left slabs of gray concrete and twisted strands of iron blanketing railroad tracks, buildings and a river bed filled with weeds and marsh grass.
The incident is the deadliest of its kind in Europe since 2001 and the latest in a string of bridge collapses in Italy.
Hundreds of firefighters and emergency officials were searching for survivors in the rubble with heavy equipment.
"We are following minute by minute the situation for the bridge collapse in Genoa", Salvini said on Twitter.
Salvini also said he wanted the "names and surnames of those who are to blame, because a tragedy like this in 2018 is not acceptable".
She said it's lucky it's summer, which means less people would be using the bridge as they're on holiday.
He told Sky TG24: "I was driving along the bridge, and at a certain point I saw the road in front of me collapse, and I went down with the vehicle".
At least four people were pulled alive from vehicles under the bridge, ANSA reported.
A witness told Sky Italia television he saw "eight or nine " vehicles on the bridge when it collapsed in what he said was an "apocalyptic scene".
"Suddenly the bridge came down with everything it was carrying".
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The head of Italy's civil protection agency, Angelo Borrelli, said 30-35 cars and three heavy trucks were on the 80-meter (260-foot) section of the bridge that collapsed. So far, 16 people have been hospitalised, including 10 in critical condition, the agency said.
Around 200 firefighters and sniffer dogs searched for survivors among the wreckage.
Danilo Toninelli, the Transport Minister, said the collapse was "unacceptable" and that if negligence played a role "whoever made a mistake must pay".
Ponte Morandi, built in the 1960s, was undergoing repairs when the tragedy happened.
Autostrade, a unit of infrastructure group Atlantia that is controlled by the Benetton family, manages the section of the toll highway that collapsed.
"The collapse was unexpected and unpredictable". The bridge was constantly monitored, even more than was foreseen by the law.
Within hours of the disaster, the anti-establishment government that took office in June said the collapse showed Italy needed to spend more on its dilapidated infrastructure, ignoring European Union budget constraints if necessary.
The design of the bridge has been criticized in the past.
He said there had been no indication that the bridge was unsafe. "But there will be a time when the cost of maintenance will be higher than a replacement", he told Italian media Primocanale. The motorway it carries is a major artery from northern Italy's industrial centres to the Italian Riviera and to France's southern coast. In 2016 he spoke with "Ingegneri.info" about construction going over budget and poor calculations over concrete viscosity that led to an uneven road surface which wasn't fully corrected until the 1980s.
"The tragic facts in Genoa remind us of the public investments that we so badly need", said Claudio Borghi, the League's economy spokesman.