I would guess, I would surmise that some of the more spectacular bombings are done by al Qaeda suiciders.
George W. BushStates like these [Iran, Iraq, North Korae], and their terrorist allies, constitute an axis of evil, arming to threaten the peace of the world. By seeking weapons of mass destruction, these regimes pose a grave and growing danger. They could provide these arms to terrorists, giving them the means to match their hatred. They could attack our allies or attempt to blackmail the United States. In any of these cases, the price of indifference would be catastrophic.
George W. BushThe Iraqi regime is a threat of unique urgency. [...] It has developed weapons of mass death.
George W. Bush