MILAN (AP) - A 51-year-old highway bridge in the Italian port city of Genoa collapsed in a driving rain Tuesday, killing at least 26 people and injuring 16 others as it sent dozens of vehicles tumbling into a heap of concrete and twisted steel.
Italian Premier Giuseppe Conte called it "an immense tragedy inconceivable in a modern system like ours, a modern country."
The disaster, on a major interchange connecting Genoa and other northern cities with beaches in eastern Liguria into France, focused attention on Italy's aging infrastructure, particularly its concrete bridges and viaducts built in the postwar boom of the 1950s and 1960s.
What caused the Morandi Bridge to fall remained unknown, and prosecutors said they were opening an investigation, but had not identified any targets. Transport Minister Danilo Toninelli said the collapse was "unacceptable" and that if negligence played a role "whoever made a mistake must pay."
Early speculation focused on the structural weakness of the span.
Witnesses reported hearing a roar as the nearly 150-foot bridge collapsed in a torrential rain during midday traffic on the eve of a major holiday that sees most Italians abandoning cities for beaches and mountains.
One unidentified woman who was standing below told RAI state TV it crumbled as if it were a mound of baking flour. Video of the collapse, showing a misty scene of crumbled concrete, captured a man screaming: "Oh, God! Oh, God!"
Civil Protection authorities said at least 30 cars and three heavy vehicles were on the 260-foot section of the span that collapsed in the industrial area of warehouses.
There was an immense gap where the bridge used to be, and one heart-stopping image showed a green truck halted on the rain-slickened roadway just short of the edge.
A man who was standing under the bridge in front of his truck at the time of the collapse called it "a miracle" that he survived. The middle-aged man, who did not give his name, said the shockwave sent him flying more than 33 feet into a wall, injuring his right shoulder and hip.
"I was in front of the truck and flew away, like everything else. Yes, I think it's a miracle. I don't know what to say. I'm out of words," he said, walking away from the site.
More than 300 rescue workers and canine crews were on the scene. They used heavy equipment and dogs to search for survivors in the rubble. At least four people were pulled alive from vehicles under the bridge, ANSA reported.
"Operations are ongoing to extract people imprisoned below parts of the bridge and twisted metal," said Angelo Borrelli, the head of Italy's civil protection agency.
Officials evacuated several hundred people living along the raised highway that traverses the city as a precaution.
The effort would continue into the night.
"It is a bit like working on an earthquake," firefighters spokesman Luca Cari said. "The main difficulty is removing the rubble and safeguarding the rescue teams."
There was confusion over the death toll throughout the day, with different officials giving conflicting numbers.
Officials in the Liguria region said Tuesday night 26 people had died, saying two more bodies had been found and one of the 16 injured had died in surgery.
After visiting the scene, Conte told RAI state TV called the tragedy "a serious wound for Genoa, Liguria and Italy."
The Italian CNR civil engineering society said structures dating from when the Morandi Bridge was built had surpassed their lifespan. It called for a "Marshall Plan" to repair or replace tens of thousands of bridges and viaducts built in the 1950s and 1960s. Updating and reinforcing the bridges would be more expensive than destroying and rebuilding them with technology that could last a century.
They cited previous accidents: a bridge that fell in April 2017 in the northern province of Cuneo, crushing a carabinieri police car after the officers and driver had barely managed to get away in time; and an overpass that in the northern city of Lecco that collapsed under exceptional weight, crushing a car and killing the driver.