Local officials in Nigeria say about 50 people have been rescued but others are still missing after a ferry went down in a remote eastern region after hitting a bridge.
Estimates of how many people were on board when the boat capsized range from 100 to more than 150.
The accident occurred on the river Benue, about 700 km (440 miles) east of the capital Abuja on Friday.
The boat was on its way from Numan in Adamawa state to Jen in Taraba state.
The vessel, which was also carrying fuel and cement, apparently hit a support of the Numan bridge on a swollen stretch of the river.
A government spokesman in Adamawa state told the French news agency AFP: "We have alerted districts downstream to watch out for bodies."
"The river was full because water was being released from the dam at Loddu," he said.