Probable answer:
...these super-high-yield explosives probably being used in many, if not most, of the various suicide and car bombings in Iraq, but these particular explosives are ones used in the triggering process for nuclear weapons.
The Nelson Report is breaking this story and Josh Marshall spreads the word:
What also emerges in the Nelson Report is that the Defense Department has been trying to keep this secret for some time, even going so far as to order the new Iraqi government not to inform the IAEA that the materials had gone missing.
[update: Josh Marshall with more as promised]
The upshot seems to be that major media as early as tomorrow morning will be "On the Story". Marshall concludes with this thunderclap and potential lightning bolt:
It's a story that really brings together the adminstration's two cardinal sins: dishonesty and incompetence.
And what other stories are they trying to push back until after November 2nd?
Quoting from the Nelson Report, Marshall reports:
I quote from Chris Nelson's summary ...
Despite pressure from DOD to keep it quiet, the IAEA and the Iraqi Interim Government this month officially reported that 350-tons of dual-use, very high explosives were looted from a previously secure site in the early days of the US occupation in 2003. Administration officials privately admit this material is likely a primary source of the lethal car bomb attacks which cause so many US and Iraqi casualties. In the first presidential candidate debate, on foreign policy, Democratic nominee John Kerry charged that captured munitions and weapons were being turned against Coalition Forces, with US troops suffering 90% of the casualties. But the specifics of the losses from the Al Qa Qaa bunker and building complex, only now being reported, were apparently unknown outside of DOD and the US occupation authorities. The Bush Administration barred the IAEA from any participation in the Iraq invasion and occupation process, and blocked IAEA requests to help in the search for WMD and other dangerous materials. As part of the UN sanctions regime still in place when the US invaded, the IAEA had "under seal" 350 tons of RDX and HDX explosives, since singly, and in combination, these materials can be used in the triggering process for a nuclear weapon. However, the explosives were allowed to remain in Iraq due to their conventional use in construction, oil pipe lines, and the like. Since the explosives went missing last year, sources say DOD and other elements in the Administration sought to block the IAEA from officially reporting the problem, and also tried to stop the new Iraqi Interim Government from cooperating with the IAEA. But finally, on Oct. 10, the Iraqi's formally notified the IAEA, and on Oct. 15, the IAEA formally notified the Bush Administration. In press guidance prepared for release in the event news got out, but not released until today, when requested by The Nelson Report, State Department spokesmen confirmed the Iraqi government and IAEA report dates, and that 350 tons of dual use high explosives could not be accounted for. State says DOD has now authorized the Iraq Survey Group to investigate the situation, which, by all accounts, took place in April, 2003. The official press guidance claims "no indications of WMD" at the Al Qa Qaa site, but concedes that the IAEA-sealed explosives were already missing at that time. Some sources say that in addition to the explosives, 20,000 RDX-armed rockets were lost, but we cannot confirm this. However, sources do say that parts of Iraqi Scud engines, and other metal components, have turned up in scrap metal yards in Amsterdam.
[...]
Marshall pomises more on this story.
These headlines make this story equally as explosive as...