The much-postponed presentation of the case that Iran is arming opponents of the US army in Iraq finally took place in Baghdad on Sunday. It was unconvincing and resembles, albeit in a minor key, Colin Powell's misrepresentation four years ago to the United Nations Security Council on Iraq's alleged possession of weapons of mass destruction.

The former secretary of state's allegations were not borne out by the facts, but they did smooth the path to invasion. The Bush administration's recent bellicosity towards Iran may only be the tactical application of pressure, but it is very risky.