Saddam Hussein may not have had weapons of mass destruction before the US-led invasion but the chief US inspector found evidence that Iraqi insurgents have tried to develop them since. In his report on the work of the Iraq Survey Group, Charles Duelfer said several rebel groups were trying to make chemical weapons to use against coalition forces. The most advanced in this quest has been a previously little known group called al-Abud, the report says, which made several attempts to produce the deadly nerve agent Tabun as well as mustard gas. It failed, because the chemists it hired lacked...