Three suspects are being held without bond in connection with an alleged armed robbery at a south Forsyth eatery that authorities say may have been an inside job.Byron Hibbert, 30, of Grayson was arrested Friday by the Forsyth County Sheriff’s Office and charged with armed robbery.Also arrested on the same charge are Dimas Perez, 19, of Snellville, and Joyce Spears, 26, of Monroe.Sheriff’s Lt. Matt Allen said the robbery occurred about 3 a.m. Friday at McDonald’s on Peachtree Parkway. He said authorities received a report that a man wearing a hooded mask approached an employee who was standing outside of the eatery and used a handgun to force her back inside. Allen said the suspect, later identified as Hibbert, walked off after taking an undisclosed amount of cash from the restaurant.Spears, the employee, called 911 and reported the robbery.