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Matt Landry of St. Bernard Parish carries Sharon Sylvia, who is diabetic, across the top of the Mississippi River levee as Isaac moves through New Orleans Wednesday, Aug. 28, 2012. Jeff Sancho, far left, with the Air National Guard, carries Sylvia's medicines. (AP Photo/The Times-Picayune, Chris Granger) MAGS OUT; NO SALES; USA TODAY OUT

Gallery: More photos from Hurricane Isaac

Aug. 30, 2012 @ 11:37 AM

Hurricane Isaac poured unrelenting rain Thursday, flooding areas north and south of New Orleans even as the city's fortified defenses held and forcing officials to launch speedy evacuation and rescue efforts in the face of fast-rising waters.