That was the munitions dump, where the IAEA had stored munitions that they found in Iraq. Until IAEA and everyone else left because Bush ordered everyone out before he invaded, these storage dumps were known and guarded. The US failed to secure them for months, instead securing the building with oil records. (Even on Fox - it looks bad -
http://www.foxnews.com/story/0,2933,137159,00.html )
As JK said in 2004, this ammo found its way into the IEDs that maimed and killed "our kids". A newsstation - I think in MN - was able to validate that we did not secure them because they had footage shot there months before it was secured by an embedded reporter.
If there would have been no OBL tape, the election would have ended with JK speaking - obviously from the heart and gut - about "our kids" being killed because of what he did not need to say was negligence - it was obvious to anyone who thought of it. It was responsible for that last surge Kerry had - that had it continued and had the OBL not pulled people back - would have led to a President Kerry.
(I found this because on a right wing sludge site, they were attacking El Baradei for what they called a fraudulent report.