ATLANTA—Workers at a northeast Georgia poultry plant said they escaped through a fog of vaporizing liquid nitrogen that killed six of their coworkers, as an investigation continued Friday into the cause of the leak at Foundation Foods Group. The Hall County Sheriff’s Office identified the victims on Friday as: 45-year-old Jose DeJesus Elias-Cabrera of Gainesville; 35-year-old Corey Alan Murphy of Clermont; 28-year-old Nelly Perez-Rafael of Gainesville; 41-year-old Saulo Suarez-Bernal of Dawsonville; 38-year-old Victor Vellez of Gainesville; and 28-year-old Edgar Vera-Garcia of Gainesville. Four people remained hospitalized, said Beth Downs, a spokesperson for Northeast Georgia Medical Center in Gainesville, with three in critical condition and one in fair condition. Investigators have begun evaluating equipment at the plant that could have played a role in the leak, but said its location and cause had yet to be determined. The state fire marshal’s office has ruled out a shut-off valve on piping that …