The response to Hurricane Katrina in 2005 was a failure at almost every level of US government, according to a sneak peak at an official report.
The report will be published later this week but some journalists have already seen it and reported what it says.
The man in charge of the report, Tom Davis, said lives would have been saved if things had been better managed.
According to US newspapers, the report says efforts to deal with Hurricane Katrina were "a national failure".
Even President George Bush didn't escape criticism, but the report did say he was let down by people working for him who didn't give him enough information.
The 600-page report also says that had the decision to evacuate New Orleans been taken earlier, lives may have been saved.
More reports to come
Two other reports into the way the US government tried to deal with Hurricane Katrina are to be published in coming months.
More than 1,300 people were killed when the Hurricane blasted through five states in the US in August 2005.