we obtained photos of ten of them >> at the time, few predicted that baghdadi would be one of the world's most wanted men. he spent ten months for unknown crime. he would have rubbed shoulders with dangerous extremists >> one of the main causes is six of isis growth was bucca where they met, where they planned. >> reporter: patrick skinner is a former cia case officer who spent time in iraq. >> everybody could see what was happening but nobody could do anything about it. >> reporter: u.s. officials who worked at bucca said they were concerned that prisoners were becoming radicalized. the prison has been described as a pressure cooker for extremism. that wasn't the only problem. it was at bucca unexpected powerful alliance was formed between the islamic extremist and ba'athists loyalist to saddam hussein. who were angry at losing power