Iraq's coalition government claims that it has uncovered documentary proof that Mohammed Atta, the al-Qaeda mastermind of the September 11 attacks against the US, was trained in Baghdad by Abu Nidal, the notorious Palestinian terrorist. Details of Atta's visit to the Iraqi capital in the summer of 2001, just weeks before he launched the most devastating terrorist attack in US history, are contained in a top secret memo written to Saddam Hussein, the then Iraqi president, by Tahir Jalil Habbush al-Tikriti, the former head of the Iraqi Intelligence Service. The handwritten memo, a copy of which has been obtained exclusively...