Authorities in North Carolina helped residents evacuate today as floodwaters inundated some towns and threatened others in the aftermath of Hurricane Matthew, which killed 14 people in the state.

Governor Pat McCrory, who announced the new death toll, warned of "extremely dangerous" conditions in the next 72 hours in central and eastern parts of North Carolina, where several rivers are in major flood stage and nearing record levels.

Wendy Key, 40, fled with her six children to a shelter in Kinston to escape flooding from the Neuse River, located about a mile from their rented home, which she had just redecorated and stocked with a new refrigerator and stove. Her brother told her the water was now waist-deep in the house.

"The water started coming pretty quickly and we had to get up and get ready in no time," Key said. "It was very alarming and disturbing."

Matthew, the most powerful Atlantic storm since 2007, killed at least 1,000 people in Haiti last week before barreling up the U.S. southeastern coast and killing more than 20 people in Florida, Georgia and the Carolinas.

The storm dumped more than 30 cm of rain in areas of North Carolina already soaked from heavy September rainfall, prompting concern that the state could see its worst flooding since Hurricane Floyd in September 1999.

That storm caused record floods in North Carolina and was blamed for 35 deaths, 7,000 destroyed homes and more than $3 billion in damages in the state.

The flooding from Matthew prompted President Barack Obama to declare that a major disaster exists in North Carolina, making federal recovery funding available in 31 counties, McCrory said.

Emergency officials have conducted more than 2,000 rescues in the state, where 32 school systems are closed, major highways remain blocked and nearly 4,000 people have taken refuge in shelters.

Officials are monitoring a number of overtopped or breaching dams in addition to the threat of inland flooding from rivers, the governor's office said.

Two of the additional deaths reported by McCrory were of people found in vehicles submerged in water. Three people are considered missing, he said.

The governor urged residents to heed evacuation orders and to avoid driving through flooded areas.

"Too many people have died," he told reporters at the state's Emergency Operations Center in Raleigh. "And we don't want any more to die."

He said a man was fatally shot by a state highway patrol officer in Lumberton last night after a confrontation occurred during rescue efforts in a flooded area.

McCrory said he did not yet have full details about the incident, which is being investigated by state police.