Two Georgia police officers have been terminated after videos of a 21-year-old man being punched and kicked surfaced online.
Two US police officers have been fired after videos emerged showing them kicking and punching a handcuffed black motorist during a routine traffic stop.
Bongiovanni pulled Hollins over in Lawrenceville, just outside Atlanta, police said.
The incident also highlights the importance of laws protecting people's rights to record police officers in public. "As he stands with his hands up, [Sergeant] Michael Bongiovanni strikes the man in the face", the police said in a statement. "We do not tolerate actions that are not consistent with our core values or state law", a police statement said.
Now, both former officers could face criminal charges after two cellphone videos captured the alleged attacks.
A shift supervisor started investigating McDonald's behavior immediately, police said. McDonald, said the police chief, was not. "Maybe then it will click to them what they did to this young man was atrocious and unacceptable and truly unbecoming of law enforcement officers".
After punching him, Bongiovanni eventually Tasered Hollins, pinned him on the ground and handcuffed him.
Bongiovanni left out the punch in his police report, authorities said.
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Bongiovanni arrested the man when he claimed to smell marijuana on him, but alleges that Hollins refused to be detained so the officer shot him with a Taser.
Ayers said a criminal investigation has begun and will be directed by the district attorney's office. The video ends shortly after the officers place the driver on the hood of a police SUV. As he got out of the auto, Hollins hit the gear shift and the vehicle began to roll, forcing McDonald to chase the vehicle, jump inside and pull the emergency brake.
In the earlier video, which had been released on social media on Wednesday, the driver - identified on Thursday as Demetrius Hollins - was being placed on the ground while in handcuffs by the officer that initially responded.
The officer then grabbed Hollins by his shoulder inside the vehicle and pulled him out.
Hollins was arrested on charges of possession of less than an ounce of marijuana, obstruction of a police officer and several traffic citations, including driving on a suspended or revoked license, operating a vehicle with suspended or revoked registration, failure to signal and "brake lights required", the paper reported.
He added, "When I had my hands up, that's when he punched me in the face". A booking photo of Hollins show his nose and lip bloodied from the encounter.
Bongiovanni said he verbally ordered Hollins to exit the auto several times and threatened to use his Taser but the man refused.
After he took Hollins to jail, Bongiovanni told a supervisor that McDonald had kicked the suspect in the head.