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New Orleans, UNITED STATES: A plea for help appears on the roof of a home flooded in the aftermath of Hurricane Katrina in New Orleans, Louisiana, 04 September 2005. New Orleans began counting its dead 04 September as US troops turned to the gruesome task of harvesting bloated corpses from the hurricane-torn city's flooded streets and homes. AFP PHOTO/POOL/Robert GALBRAITH (Photo credit should read ROBERT GALBRAITH/AFP/Getty Images)

New Orleans, UNITED STATES:  A plea for help appears on the roof of a home flooded in the aftermath of Hurricane Katrina in New Orleans, Louisiana, 04 September 2005. New Orleans began counting its dead 04 September as US troops turned to the gruesome task of harvesting bloated corpses from the hurricane-torn city's flooded streets and homes.   AFP PHOTO/POOL/Robert GALBRAITH  (Photo credit should read ROBERT GALBRAITH/AFP/Getty Images)