George W. Bush adopted Peter Pace's statement that the explosively formed penetrators (EFP's) are coming from Iran and he doesn't know whether or not the Iranian leadership knew it or authorized it.
Remember the anthrax attack
This is a two-step. He makes himself look reasonable, for a change, but asserts the unknowable that they "know" the EFP's are coming from Iran. The EFP's could be US built, just the way the anthrax used in the anthrax attack came from a US weapons lab on a US military base.
For the sake of tens of trillions of dollars, the oligarchs would sell their own mothers and children.