Terenzio McCurty, 23, got out of the vehicle with a handgun and was shot in the leg by and Atlanta police officer, GBI spokeswoman Nelly Miles said.
McCurty and John Penceil, 50, tried to run but were caught and arrested.
Officers later found suspects Joshua Fowler and Demetrius Sims. Fowler, 25, was found hiding in a dumpster, and Sims, 43, was found hours later in the same area.
Both McCurty and Patrick were treated at Grady Memorial Hospital, Atlanta police Maj. Jeff Glazier said.
The GBI is investigating the shooting.
“When the investigation is completed, it will be turned over to the District Attorney for review,” Miles said.