By Sam Olukoya
Recently Nigerian police rescued about 200 "child slaves" from forests in the south-west, where they were forced to work in granite mines or digging sand.
The children will be scarred for life
They have arrested about seven members of a syndicate accused of involvement in the trafficking of children from neighbouring Benin.
The children, mainly aged between five and 15, are either snatched from their families or lured away with promises that they are being taken to Nigeria to further their education.
In the forests around the town of Abeokuta, they dig several lorry loads of sand and granite every day, which are transported to Nigerian cities to be sold as building materials.
One of the recently rescued children, Macenia Boha, says they were beaten if they did not work hard enough and also if they asked for food, even if they were hungry.
"You are always hungry," he said.
"They are bad people. They did bad things to us."
Macenia is lucky to have lived to tell his story.
A number of children are known to have died in the forest. Alexis Kesinu, who is about 12-years-old, says while he was in the forest he saw six children die.
He said the "masters" would not let the children take any time off, even if they were ill.
"When they went back to work they died," he said.
But it is not just the harsh conditions and ill health that cause deaths among the captive children - they are also at risk from wild animals
living in the forests.
They were delighted to be freed
"We were sleeping on the sand and we saw an animal. When it came it attacked a child, who died," said another of those rescued, Mansua Bokovo.
"But I don't know where the corpse was
It is unclear how long the syndicate has been holding children in the forest.
Some children who were rescued say they spent up to seven years in the forest and it is thought that thousands of children are still being held in
forests spread across south-western Nigeria.
Song of freedom
There is no doubt the children
I met, even though they are free now, will remain scarred by the trauma of
their ordeal in the forests.
Kekere Nocham, who is just about five-years-old, says the children used to sing a protest song while in captivity.
The song says that while the servant who does all
the work is starving, the master who does nothing becomes fat.
For these children, this songs rings all too