Some streets were closed to traffic in the area of Martin Luther King Junior Parkway from University Drive to Dixon Road.
Motorists were advised to avoid the area if possible.
The Durham County Sheriff's Office bomb squad checked out a suspicious box at the N.C. Department of Revenue office on Westgate Drive. About 25 employees were evacuated.
Pictures from Chopper 11 HD showed a bomb technician using a portable x-ray machine to see the contents. A few minutes later, investigators opened the box and carried it away - showing it was not a bomb.
A source later said the box contained dental equipment.
The evacuated employees were allowed to return to work.
A few miles away over on Mossdale Avenue, the bomb squad was checking out a report of the discovery of a mortar shell believed to date back to the Second World War.
A police spokesperson said a landscaper found the device in the yard of a home.
Bomb technicians examined the device and determined it was not dangerous.