Part of a bridge over Brazil's Moju River collapsed early Saturday, after a ferryboat collided with a bridge pillar.
Two cars were seen plunging into the river, but it's unclear how many people were in the vehicles with scuba divers searching the river.
The five crew on the ship are said to have survived.
The bridge, which connected one of the country's busiest ports, will potentially affect shipment of grains.
Pará governor Helder Barbalho has signed a state of emergency after the accident.

Sydney brings in New Year with nod to victims of Bondi attack
Russia releases video footage to challenge Kyiv over alleged attack
Thailand frees 18 Cambodian soldiers as ceasefire holds
Mali and Burkina Faso announce reciprocal travel ban on US
Four injured in Russian attack on Odesa, Ukraine says