In pictures: Sudan's slave voices

Akech Arol Deng: "My wife Abuk Deng Rual and my son Deng Akech Arol were both abducted in 1988 - he was just three years old.

I have been to the north but could not find them. Some southerners I met said they had seen my family but they had been separated.

I feel so sad because I miss them so much. I really hope that one day they come back.

If my wife has been taken as a wife by an Arab man and comes back with children, I would gladly accept them as my own."