Children in parts of the world affected by conflict are being abused by the people who are supposed to be looking after them.
A report by the the UK charity, Save the Children, says that children as young as six are being sexually abused by peacekeepers and aid workers drafted into post-conflict zones to help with humanitarian care.
Save the Children says the most shocking aspect of this abuse is that the vast majority of it goes unreported and unpunished.
Children and their families are too scared to speak out because of fear and powerlessness.
The BBC's Adam Mynott reports from Ivory Coast in West Africa.
Listen Listen to his report (3 mins 58 secs)
Save the Children says there is widespread evidence that children are being traded for food, money, soap and even mobile phones in war zones and disaster areas.
The problem isn't new, but what is most disturbing, says the charity, is that the United Nations and aid agencies have promised to tackle the problem in recent years but have failed to act effectively.
Larry Hollingworth is a very experienced former UN aid worker.
Does he believe that the response to this problem has not been serious enough?
Listen Listen to Larry Hollingworth (3 mins 8 secs)
First broadcast 27 May 2008