Rescue teams in northwestern Nigeria were searching Monday for survivors after a boat capsized with dozens of people on board.

The accident happened Sunday in Jigawa state, according to local authorities.

Police spokesman Shi'isu Adam said up to 40 people drowned when the boat sank while crossing a river. Women and children were among them, he said.

One body was recovered on Sunday. Five more were found early Monday.

Nigeria's National Emergency Management Agency gave a different, lower toll. It said five deaths have been confirmed so far, with up to 20 people still missing.