The bridge collapsed under the force of the blast, spreading the fire to a auto park where several other vehicles caught fire and exploded.
According to the news agency, Italian media said a lorry carrying cars collided on a bridge with another tanker lorry containing inflammable materials.
Photos from the scene show that several lanes of the highway have collapsed, while the flames also spread to several cars parked under and adjacent to the highway at a Peugot dealership, sending more plumes of black smoke into the air. The incident, which took place near the Bologna Airport, injured at least 50 people in all, but other media outlets reported that as many as 60 or 70 people were hurt.
Police say there has been an accident on the motorway close to the airport.
Fire raging on the motorway outside Bologna
Reuters Scores of people have been injured in the blast.
A video shot from a parked auto at the moment of the explosion appeared to show someone being engufled by flames when the tanker exploded.
Italy's firefighters tweeted that they have sent multiple rescue and emergency squads, including one from their urban search and rescue team.
Italian media reported that numerous injured were hit by debris and shattered glass after the explosion.
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