Mandatory evacuation ordered after dam breach in SC

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COLUMBIA, S.C. -- A mandatory evacuation was ordered downstream from the Overcreek dam after a breach Monday, a spokeswoman for the city of Columbia told CNN. Authorities were working to determine the severity of the situation, Shawn Washington said.

Gov. Nikki Haley said Monday that more evacuations are likely as floodwaters rise in spots, and authorities warned of the danger of roads that look OK on the surface but that may have been undermined by raging waters.

"We can't let our guard down. Conditions are still dangerous out there," South Carolina Department of Public Safety Director Leroy Smith said at a news conference.

According to Smith, nine people are known dead in the state due to weather-related incidents. Five drowned after trying to drive through floodwaters. Four others died in traffic accidents, he said.

One of the deaths was a state transportation employee.

Timothy Wayne Gibson, 45, died Sunday in floodwaters while overseeing work in Columbia, the South Carolina Department of Transportation said.

In North Carolina, one person died when a tree fell onto Interstate 95, killing a passenger in a car, according to authorities.

Haley warned there could be other deaths.