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In the aftermath of Hurricane Katrina, Bush administration officials said they had been caught by surprise when they were told on Tuesday, Aug. 30, that a levee had broken, allowing floodwaters to engulf New Orleans. But Congressional investigators have now learned that an eyewitness account of the flooding from a federal emergency official reached the Homeland Security Department's headquarters starting at 9:27 p.m. the day before, and the White House itself at midnight. White House officials have confirmed to Congressional investigators that the report of the levee break arrived there at midnight, and Trent Duffy, the White House spokesman, acknowledged as much in an interview this week, though he said it was surrounded with conflicting reports. But the alert did not seem to register. Even the next morning, President Bush, on vacation in Texas, was feeling relieved that New Orleans had "dodged the bullet," he later recalled. Mr. Chertoff, similarly confident, flew Tuesday to Atlanta for a briefing on avian flu. With power out from the high winds and movement limited, even news reporters in New Orleans remained unaware of the full extent of the levee breaches until Tuesday.