Obama pledges more flood help after Hurricane Isaac
US President Barack Obama has toured areas of Louisiana hit by Hurricane Isaac, praising the strength of the flood defences but pledging more help.
He spoke of "enormous devastation", praised those who saved lives and hailed disaster relief co-ordination by state and federal authorities.
Thousands of evacuees are in shelters, or with friends and relatives.
Isaac killed seven people - five in New Orleans and two in Mississippi - seven years after Hurricane Katrina.