The US army handed control of Camp Cropper prison to Iraqi authorities Thursday, effectively ending one of the most controversial chapters of the American military occupation. Cropper, west of Baghdad and now holding 1,600 detainees, opened immediately after the US-led invasion of Iraq in March 2003. The prison was built to handle senior members of Saddam Hussein's toppled Baathist regime. The dictator himself was its most famous inmate after his capture in the wake of the invasion and eventual execution in December 2006. An official transfer of authority ceremony involving US and Iraqi military officers took place at 11:30 A,M. (0830 GMT). “This is the first day of a new era,” US deputy commanding general for detainee operations Jerry Cannon told a crowd of about 100 Iraqi and US officials at the event. “One in which all elements of the Iraqi criminal justice system are able to assert their role in providing the continuous safety and security of the Iraqi people,” he said. More than 100,000 prisoners have passed through US custody in Iraq, where Camp Bucca near Basra was closed in September 2009 and Camp Taji north of Baghdad shut earlier this year. Among the last of Saddam's inner circle to leave Camp Cropper was former deputy prime minister Tareq Aziz, who was transferred to Khadimiyah prison in Baghdad Tuesday night. Saddam's former secretary Abed Hmoud, the former interior minister Mohammed Zumam and former oil minister Amir Mohammed Rashid, were among 25 other prisoners moved together with Aziz. Cropper was originally a tented site but it was upgraded after the Abu Ghraib prison scandal in 2004 where photographs showed naked and hooded Iraqi prisoners being beaten and humiliated by their US guards. General Ray Odierno, the commander of US forces in Iraq, told reporters on Tuesday that the handover of Camp Cropper had been planned for one year and a system of training and safeguards had been put in place. – AgenciesHe also said Cropper proved that the American military had learned lessons from Abu Ghraib, regarded as the nadir of the US occupation. “Abu Ghraib is a lesson that we were not prepared to handle large masses of detainees when we came into this operation in 2003,” Odierno said. “We made some real errors in thinking it was going to be like Desert Storm and we would just hold prisoners of war for a period of time. “We did not properly anticipate a counter-insurgency which would require us to handle a large number of detainees... in fact we were not trained and prepared to do it. And we ended up having significant issues,” he added. Despite Thursday's handover around 200 high value detainees will stay under US control at Camp Cropper, Odierno and the Iraqi government have said.