Michael Mahrt, the charity’s child protection adviser, said: ‘The reports of sexual violence against children are unconfirmed but they are consistent and were repeated across the four camps we visited.

‘Children told us they have witnessed horrendous scenes. Some said they saw their fathers murdered and mothers raped.

‘They described things happening to other children but they may have actually happened to them and they are just too upset to talk about it – it’s a typical coping mechanism used by children who have suffered such abuse.