The FBI “most wanted” mugshot shows a tough, swarthy figure, his hair in a jailbird crew-cut. The $10 million price on his head, meanwhile, suggests that whoever released him from US custody four years ago may now be regretting it. Taken during his years as a detainee at the US-run Camp Bucca in southern Iraq, this is the only known photograph of Abu Bakr al-Baghdadi, the new leader of al-Qaeda in Iraq and Syria. But while he may lack the photogenic qualities of his hero, Osama bin Laden, he is fast becoming the new poster-boy for the global jihadist movement....