
He stressed that the United States has a strategy for dealing with improvised explosive devices (IEDs) like roadside bombs. US military intelligence sources have said that increasingly powerful IEDs, with greater armor-piercing power and sophisticated triggers, have been traced to mullahs Revolutionary Guards or to Lebanese Hezbollah backed by the clerical regime in Iran.
President Bush said that there was evidence that some components in the most powerful IEDs came from Iran, and that coalition forces had "seized IEDs and components that were clearly produced in Iran."
Last week, US Defense Secretary Donald Rumsfeld directly accused the Tehran for the first time of sending Revolutionary Guards into Iraq to make trouble.

