Hundreds of people were rescued by boat and helicopter as floodwaters inundated North Carolina towns on Monday in the wake of Hurricane Matthew, and officials warned that life-threatening flooding from swollen rivers would continue for days.
Matthew, the most powerful Atlantic storm since 2007, was downgraded to a post-tropical cyclone on Sunday.
The hurricane killed around 1,000 people in Haiti and United Nations Secretary-General Ban Ki-moon said on Monday some Haitian towns and villages had just about been "wiped off the map."
In the United States, the number of fatalities rose to at least 23, with nearly half in North Carolina.
North Carolina's skies were clear on Monday after the state received as much as 18 inches (39 cm) of rain from Matthew over the weekend, but raging rivers and breached levees posed major problems.