Syria ex-detainees allege ordeals of rape and sex abuse
25 September 2012 Last updated at 22:50 BST
This report contains graphic accounts of sexual violence.
As the conflict in Syria continues to intensify the BBC has heard allegations of sexual violence, including rape, taking place within government detention centres.
The British government is asking the UN to address the issue and calling for those responsible to be held to account.
The BBC's Fergal Keane travelled to the Middle East and spoke to some of the victims.