From Hugh Hewitt:
The Fox News Channel's Major Garrett was just on my show extending the story he had just reported on Brit Hume's show: The Red Cross is confirming to Garrett that it had prepositioned water, food, blankets and hygiene products for delivery to the Superdome and the Convention Center in the immediate aftermath of the hurricane, but were blocked from delivering those supplies by orders of the Louisiana state government, which did not want to attract people to the Superdome and/or Convention Center. Garrett has no paper trail yet, but will follow up on his verbal confirmation from sources at the highest levels of the Red Cross.
UPDATE: A transcript is here. Apparently the Red Cross had a "literal vanguard of trucks with water, food, blankets and hygiene items". On Monday or Tuesday ("immediately after the storm passed"), at an as yet unknown time, the Louisiana Department of Homeland Security explicitly told them they couldn't come to the Superdome to distribute those goods.
From the transcript:
HH: Any doubt in the Red Cross' mind that they were ready to go, but they were blocked?
MG: No. Absolutely none. They are absolutely unequivocal on that point.
HH: And are they eager to get this story out there, because they are chagrined by the coverage that's been emanating from New Orleans?
MG: I think they are. I mean, and look. Every agency that is in the private sector, Salvation Army, Red Cross, Feed The Children, all the ones we typically see are aggrieved by all the crap that's being thrown around about the response to this hurricane, because they work hand and glove with the Federal Emergency Management Agency. When FEMA is tarred and feathered, the Red Cross and the Salvation Army are tarred and feathered, because they work on a cooperative basis. They feel they are being sullied by this reaction...
The state Homeland Security Department had requested--and continues to request--that the American Red Cross not come back into New Orleans following the hurricane. Our presence would keep people from evacuating and encourage others to come into the city.
See also the Sep. 3 article "Homeland Security won't let Red Cross deliver food".