The suspects, Candace Marie Richardson, 21, Nettleton, and Larry Alex Christian, 26, Fulton, were extradited on August 8.
They will be arraigned tomorrow (August 10) in the Monroe County Justice Court.
The other two suspects in the incident are already in custody. Katherine Payne, 21, Tupelo, and Anthony Ray Loague, 28, Fulton, were arrested and charged with armed robbery on July 31. Bond for Payne was set at $75,000; bond for Loague was set at $100,000.
All four suspects are currently being held in the Monroe County Detention Center.
The arrests were the result of cooperation among the Monroe County Sheriff's Office, the Itawamba County Sheriff's Office and the Kenner Police Department in Kenner, La., along with federal marshals.
On the evening of July 28, the Sheriff's Office responded to a call from an individual who said he had been robbed in the Black Cat Bottom Road area just north of Amory.
The victim said he was lured to the area by Richardson and Payne; he alleged that he was subsequently ambushed by Christian and Loague, who had weapons, and who took about $1,000 in cash and a cell phone.
Christian and Loague are believed to be members of the Simon City Royals, a gang that is popular at Parchman.