The CIA took naked photographs of people it sent to its foreign partners for torture. A former US official who had seen some of the photographs described them as very gruesome". In some of the photos, which remain classified, CIA captives are blindfolded, bound and show visible bruises. Some photographs also show people believed to be CIA officials or contractors alongside the naked detainees. It is not publicly known how many people ... were caught in the CIA's web of so-called "extraordinary renditions", extra-judicial transfers of detainees to foreign countries, many of which practised even more brutal forms of torture than the US came to adopt. Human rights groups over the years have identified at least 50 people the CIA rendered, going back to Bill Clinton's presidency. "Is the naked photography a form of sexual assault? Yes. It's a form of sexual humiliation," said Dr Vincent Iacopino, the medical director of Physicians for Human Rights. "It's cruel, inhumane and degrading treatment at a minimum and may constitute torture," he said. International human rights law, to include the Geneva conventions, forbids photographing prisoners except in extremely limited circumstances related to their detention, to include anything that might compromise their dignity. The CIA is known to have employed nudity in other aspects of its custody of terrorism suspects. Often the nudity occurred in tandem with other torture techniques, such as shackling and frigid conditions, leading in at least one case to a detainee's death.