As we have gone on the offensive in former al Qaeda and insurgent sanctuaries, and as locals have increasingly supported our efforts, we have found a substantially increased the number of arms, ammunition and explosives caches.

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"I had a very clear view of them standing up with backpacks under them that also had additional ammunition and explosives and I could see them bending down and reaching in and getting things out of their backpacks, which included their explosives and their pressure-cooker bomb, " Mr Fitzenberg said.

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The complex, south of Tehran, is dedicated to the research, and the development and production of ammunition, rockets and explosives.

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He said it was "a major act of decommissioning" in which arms, ammunition, explosives and explosive devices were destroyed.

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The ship, Yemen says, contained Iranian-made bomb-making material, suicide belts, explosives, rockets, surface-to-air missiles, grenades and ammunition.

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Bernard Zapor -- the Bureau of Alcohol, Tobacco, Firearms and Explosives special agent in the investigation -- said Monday that the 9mm semiautomatic handgun with multiple ammunition magazines used by the attacker had been legally purchased.

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