BAGHDAD, Iraq -- Iraq took the unusual step of issuing an explanation for a missile warhead discovered yesterday by UN arms inspectors -- before the monitors themselves made the news public. The inspectors found the abandoned case of a small rocket and a "modified, damaged and abandoned warhead" at a missile parts factory south of Baghdad, the Iraqi News Agency said, describing it as a Russian-made Luna -- a short-range rocket permitted under UN resolutions. Iraq, however, rarely reports on what the inspectors find. The report appeared timed to give Iraq's version of events before the discovery was publicized by...