Earlier, Master Police Officer Robert McDonald was sacked for his involvement in the arrest of Demetrius Hollins, 21, during a traffic stop near the town of Lawrenceville.
Moving swiftly, the police department announced at a press conference Thursday afternoon that McDonald has been terminated, and there now is a criminal investigation into McDonald's actions.
It shows the handcuffed driver, 21-year-old Demetrius Hollins, on the ground and in handcuffs held down by an officer.
The department says both men are now under criminal investigation.
A Georgia police department fired a second officer after footage surfaced Thursday showing him punching a suspect in the face.
Sgt Michael Bongiovanni, a servant of the force for 19 years, and officer Robert McDonald were dismissed for attacking Demetrius Hollins, after the motorist was pulled over in traffic for not having a number plate.
In his police report, Bongiovanni said Hollins' auto didn't have a license plate and that he didn't immediately pull over.
The video, which was posted online, shows an officer appearing to yell orders at a handcuffed man who then lies face-down in a left-turn lane of the busy intersection.
Hollins has been charged with multiple traffic citations, obstruction of a police officer and possession of less than an ounce of marijuana.
After the arrest, the shift commander initiated an immediate investigation into the incident.
Hollins was approached by reporters outside the county jail, where he was released on $7,500 bail.
McDonald had been placed on administrative leave earlier this week, resulting in his firearm being confiscated, police said. Both men are now under criminal investigation.
No working number could be found for McDonald, and the voicemail at a number listed for Bongiovanni was full. It wasn't immediately clear whether either man had an attorney.
The Solicitor's Office is the prosecuting authority for misdemeanor cases and traffic offenses in Gwinnett County. Michele Pihera told The Atlanta Journal-Constitution.
Bongiovanni smelled marijuana when he approached the auto in both cases and called for backup, the reports say.
Hollins turned away from the officer. He wrote that Hollins was acting unusual and started yelling, "I need my mom". That triggered Bongiovanni's memory of the August arrest, and he chose to call for backup, according to the report.
According to Bongiovanni's report, he tased Hollins, put him on the ground and handcuffed his arms behind his back - an acceptable response to a suspect refusing to cooperate with an investigation. Hollins came out with his hands in the air.
A second video later surfaced that purportedly shows Hollins being punched in the face by Sgt. Michael Bongiovanni as he stepped out of his vehicle in Lawrenceville, Georgia.
His mug shot, obtained by the paper, shows blood on his nose and lips.
Bongiovanni pulled Hollins over in Lawrenceville, just outside Atlanta, police said.
"When I first saw the video, I immediately got the chills", Page told ABC News. "When I had my hands up, that's when he punched me in the face".
Police released dashcam video of the confrontation, which occurred Monday after the officer left his patrol vehicle and approached accused jaywalker Nandi Cain Jr. on a residential street. Police report identifies Hollins as black. If you would like to discuss another topic, look for a relevant article.