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.

US, Iran begin direct talks in Pakistan, seeking end to six-week war
Artemis II astronauts safely back on Earth after trip around moon
Israeli strikes kill seven in Gaza, health officials say
Iran demands Lebanon ceasefire, unfreezing of assets before peace talks
New Zealand authorities order thousands to evacuate ahead of tropical cyclone