Traffic wardens say a bus carrying women in southwest Nigeria crashed and plunged off a bridge into a river, killing at least 12 people.

Jonas Agwu, a spokesman for Nigeria's Federal Road Safety Corps, said Saturday that rescuers need a crane to lift the minibus out of the river in Ogun state. He said authorities believe 21 people were on the bus at the time of the crash Friday, with three women rescued from the site.

So far, Agwu said workers had recovered 12 bodies from the crash, with six others believed still missing. Agwu said the river's speed could have swept the corpses downriver.

Traffic crashes remain all too common in Nigeria, a nation with potholed highways and many speeding drivers.