KENNESAW, Ga. — A FedEx employee wearing ammunition draped across his chest "like Rambo" opened fire Tuesday at a package-sorting center outside Atlanta, wounding six people before committing suicide, police and witnesses said.In addition to a shotgun, the gunman also had an undisclosed number of Molotov cocktails, but he did not use them in the attack, police said.The suspect, identified by police as 19-year-old Geddy Kramer of Acworth, was found dead inside. He worked as a package handler at the sprawling facility, Cobb County police Sgt. Dana Pierce said.Investigators have an idea of what his motive may have been, but they were not prepared to disclose it yet, Pierce said.Three of the victims were critically wounded, though only one remained in critical condition by late afternoon. Police say three were in stable condition, and two others were treated and released.Kramer first drove his car to a security shack outside the building and shot a guard there before heading inside, the news release said.David Titus, a FedEx truck driver, said he was just coming to work around 6 a.m. when he saw a security guard shot in the abdomen.