A FORMER US Army torturer has described the traumatic effects of American interrogation techniques in Iraq - on their victims and on the perpetrators themselves.

Tony Lagouranis said he conducted mock executions, forced men and boys into agonising stress positions, kept suspects awake for weeks on end, used dogs to terrify prisoners and subjected others to hypothermia.

But he said he was deeply scarred by the realisation that what he did had contributed to the plight of US forces in Iraq.