, cursing, insult, and harshness." >> smith: zarqawi rejected the advice. (loud explosions) >> shock and awe, but this time sunni insurgents were sending in the bombs. the series of coordinated blasts were in mainly shia areas. sunni militants out to stoke sectarian tensions did so with ferocious efficiency. >> smith: in 2005, jolani's jihadist career in iraq was cut short. he was arrested by u.s. troops in mosul. he would spend most of the next five years imprisoned in camp bucca near the kuwaiti border. around 100,000 detainees came through bucca, including nine future al qaeda in iraq and isis commanders. >> in fact, it was the training ground for a whole new generation of middle eastern extremist terrorists. the most extreme elements had total control of the camp. the u.s. military didn't see bucca as a big problem. but what was happening in bucca was, it was a wholly owned subsidiary of al qaeda. >> smith: jolani was 23 when he arrived here. he says he used his time to write a 50-page paper on how to fight jihad back home in syria. >> i definitely hear