A possible dam failure near the Tangipahoa River has prompted authorities to issue mandatory evacuations of 60,000 residents in nearby communities in both Louisiana and Mississippi.
Tune to CNN for continuing coverage of the aftermath from Tropical Storm Isaac.
The National Hurricane Center reports that Isaac has downgraded to a tropical storm. Its maximum sustained winds slipped to 70 mph. Isaac has already caused more than 725,000 people to be without power across five states.
Mayor Mitch LandrieuÂ has issued a dusk-to-dawn curfew as the storm continues to pound the city of New Orleans.
CNN's Erin Burnett and Wolf Blitzer talks to New Orleans Mayor Mitch Landrieu about his city's preparation for tropical storm Isaac. FULL POST