BBC said:Former US Secretary of State Colin Powell has said he fails to understand why better preparations were not made before Hurricane Katrina struck.
Two-thirds of Americans think President George W Bush could have done more to tackle the floods and damage in the south, one opinion poll suggests.
One member of Mr Bush's staff said such allegations "broke his heart".
With New Orleans still not completely evacuated, its police chief warned that to stay would be "suicidal".
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There were "a lot of failures at a lot of levels - local, state and federal", Mr Powell told ABC.
"There was more than enough warning over time about the dangers to New Orleans - not enough was done," he said.
Mr Powell's views will be heard with particular interest as he is a highly respected figure and a prominent black American, the BBC's Justin Webb reports from Washington.
The Pew Research Center, which ran the new opinion poll, also indicated that two-thirds of the African-Americans questioned believed the government reaction would have been faster if most of those affected had been white.
But Mr Powell said so many African-Americans were left unprotected be cause they were poor, rather than because they were black.
It "should have been a blinding flash of the obvious... that when you order a mandatory evacuation, you can't expect everybody to evacuate on their own", he said.
Debate still rages in Washington into how independent the inquiries being launched into Katrina - led by President Bush himself and the Senate - will really be.
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