The International Labour Organisation (ILO) has announced a $10.8m fund for Uganda and Malawi to jointly work to combat child labour on the African continent.(file photo).

Authorities in Ivory Coast say they rescued 137 children who were the victims of traffickers and groomed to work on cocoa plantations or in prostitution.

Police rescued the children after surrounding the eastern town of Aboisso and carried out a two-day search of cars, farms, and nearby villages.

Officials say the children ranged from age six to 17 and were brought into Ivory Coast from Benin, Ghana, Niger, Nigeria, and Togo. The victims are in care of a charity in Aboisso while authorities search for their parents.

Senior police officials say they plan to increase operations aimed at stopping child trafficking.

"Ivory Coast's image is tarnished by child trafficking. We are appealing to all parents: a child's place is at school and not on plantations," Aboisso's deputy police chief Kouadio Yeboue Marcellin says.

Ivory Coast is dependent on the cocoa and cashew crops and poor farmers depend on child labor to pick the beans and nuts.

Western chocolate companies, including some of the biggest such as Nestle and Hershey, have pledged to stop buying beans produced by child workers. Critics say such efforts have been only modestly successful.