A former CIA explosives expert who still works in Iraq told me: "The Iranians are making them. End of story." His argument is only a state is capable of manufacturing the EFP's, which involves a complicated annealing process.

The US Army has already found a factory that was producing EFPs in Iraq. Also, the suggestion that Iraq is not capable of producing weapons that originated during WW2 is preposterous, especially when you consider the reason for the war in the first place, Saddam Hussein's attempt to develop atomic weapons. Producing a gas centrifuge for enriching Uranium is far harder that producing a shaped copper disc for an EFP.

"Incidentally, he also is convinced the IRGC is helping Iraqi Shia militias sight in their mortars on the Green Zone. "The way they're dropping them in, in neat grids, tells me all I need to know that the Shia are getting help. And there's no doubt it's Iranian, the IRGC's," he said.".

The Shia were always well represented in the Iraqi Army, Saddam Hussein needed the cannon fodder for his war against Iran and the invasion of Kuwait. As a result, any suggestion that the Shia wouldn't have people skilled in using mortars is preposterous.