An overpass north of Milan has collapsed under the weight of a truck carrying an oversized load just hours after highway authorities say they requested the road's immediate closure.

The news agency ANSA said one person was killed and at least three injured in the collapse Friday.

Italian television images show the highway overpass split in two as firefighters worked under spotlights to determine if there were more victims. Video showed a red car crushed beneath the truck.

The highway authority said in a statement that it had asked for the overpass to be closed after pieces of concrete had fallen from it Friday, but that provincial officials had requested a formal order before acting.

Italian police say the truck carrying steel coils was marked as bearing an oversized load.