A group of motorcyclists encircle Lien’s SUV
Eyewitness News has obtained new video of the assault on an SUV driver by a group of motorcycle riders last month.

The video, obtained by Eyewitness News reporter Darla Miles, comes from a witness to the incident. Police have seen the video, which we warn you is violent and graphic.

The expletive-laden video could answer key questions about the case of road rage.

The assault lasts about 20 seconds and shows shows bikers gathered around Alexian Lien, stomping on him and beating him.

Sources tell Eyewitness News that 40-year-old Jason Brown is the man seen beating Lien with his helmet, hitting him so hard the visor broke.

Brown is the ninth biker charged in the case.

Prosecutors believe most of those arrested can be seen on the new video.

A biker in a blue shirt who approaches the SUV is believed to be Clint Caldwell, while the man who bashes the rear window of the Range Rover at the end of the original clip is thought to be undercover narcotics detective Woljiciech Braszczok.

Police believe the biker with the number 13 on his back, seen kicking Lien, is Craig Wright, while a biker holding holding his helmet with both hands striking Lien is believed to be James Kuehne.

Finally, the man with the black and silver jacket is believed to be Kaliq Douglas, who was arrested on Friday.

When the attack ends, Lien can be seen left lying motionless in the middle of the street.

The incident happened on September 29 as the group of motorcyclists rode up the Henry Hudson Parkway following a rally.

Lien was driving the SUV that bumped a motorcycle after biker Christopher Cruz, 28, had slowed down in front of him.

Motorcyclists then surrounded and converged on the Range Rover, prompting Lien to hit the gas and run over another biker, who was left paralyzed. Lien claims he was fearing for his life and family, with his wife and 2-year-old daughter also in the vehicle.

The bikers chased Lien, caught up to him in traffic, pulled him from the vehicle and attacked him, police and prosecutors say. The encounters were partly caught on a helmet-camera video posted online.

Lien hasn't been charged with any crime and continues to recover from injuries he suffered during the assault.