IT makes a chilling picture. The mastermind behind the September 11 attacks has told interrogators that he and his terrorist nephew leafed through almanacs of US skyscrapers when planning the operation. Sears Tower in Chicago and Library Tower in Los Angeles – which was "blown up" in the film Independence Day – were both potential targets, according to transcripts of interrogations of al-Qa'ida operations chief Khalid Shaikh Mohammed. "We were looking for symbols of economic might," he told his captors. He recounted sitting looking at the books with Ramzi Yusuf, his nephew by marriage, who was the man behind the...