Police rushed to the center after someone called to report an active shooter at 5:54 am After surrounding the perimeter and working to clear the building, officers found the suspect dead, Cobb County police spokesman Michael Bowman said.
He said there were no immediate reports anyone else had been killed.
FedEx clerk Liza Aiken said she was working inside when she heard something, dropped, looked to her left and saw the gunman.
Before she could continue, a woman wearing a FedEx jacket told Aiken to stop talking and led her away.
Six people wounded at the FedEx station were taken to nearby Wellstar Kennestone hospital, where spokesman Tyler Pearson said one victim was rushed to surgery with potentially critical injuries. Others were less serious.
"A lot of them were able to walk off the ambulance," Pearson said.
David Titus, a FedEx truck driver, said he was just coming to work when he saw someone walk up and shoot a security guard in the abdomen outside the building. He said he could hear more gunshots after the gunman went inside.
FedEx said the facility north of Atlanta is a hub where packages are sorted and loaded onto vehicles for delivery. It's located next to the general aviation airport for suburban Cobb County.
