U.S. command had considerable evidence that the Mahdi army had gotten the technology and the training on how to use it from Hezbollah rather than Iran.
The command, operating under close White House supervision, chose to deny these facts in making the dramatic accusation that became the main rationale for the present aggressive U.S. stance toward Iran. Although the George W. Bush administration initially limited the accusation to the Quds Force, it has recently begun to assert that top officials of the Iranian regime are responsible for arms that are killing U.S. troops.
British and U.S. officials observed from the beginning that the EFPs being used in Iraq closely resembled the ones used by Hezbollah against Israeli forces in Southern Lebanon, both in their design and the techniques for using them.
Hezbollah was known as the world’s most knowledgeable specialists in EFP manufacture and use, having perfected them during the 1990s in the military struggle against Israeli forces in Lebanon. It was widely recognised that it was Hezbollah that had passed on the expertise to Hamas and other Palestinian militant groups after the second Intifada began in 2000.
U.S. intelligence also knew that Hezbollah was conducting the training of Mahdi army militants on EFPs. In August 2005, Newsday published a report from correspondent
Mohammed Bazzi that Shiite fighters had begun in early 2005 to copy
Hezbollah techniques for building the bombs, as well as for carrying out roadside ambushes, citing both Iraqi and Lebanese officials.