Bikers Attack SUV in New York City, Beat Up Driver

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In a harrowing new viral video, a group of bikers chase down a man out for a Sunday drive in Manhattan, dragging him out of his vehicle and beating him up in front of his wife and child.

The ugly incident started when 33-year old Alexian Lien accidentally struck a biker who cut him off on the Henry Hudson Parkway.

From there, a four-mile chase ensued, with as many as 30 riders on sport/dirt bikes going after Lien down the highway.

They catch up to him at a red light in Washington Heights and the video - taken by a biker with a helmet camera - clearly shows one of the men smashing the driver's side window of Lien's Range Rover. His two-year old daughter is in the backseat.

Lien, who works as director of the e-commerce firm, was punched and slashed in the face with a knife, according to police.

The attackers fled by the the time authorities reached the scene, where they found a bloodied Lien face-down on the pavement.

He was taken to Columbia University Medical Center, where he received stitches for his wounds and was later released.

The confrontation started around 2 p.m. Sunday after a biker swerved in front of Lien. The video depicts Lien stopping to check on this victim, but then driving away after a group of bikers begin banging on his car.

"He’s surrounded by about 20 to 30 motorcyclists,” NYPD Commissioner Raymond Kelly said of the initial incident. “They take their helmets and they start to dent his car and apparently his tires are slashed there with a knife. He’s in the car with his wife. He continues to drive.”

Lien hit three motorcyclists during this getaway, breaking the legs of one of them.

The above footage cuts off soon after the bikers catch up to Lien and vandalize his SUV, but cops confirm his subsequent beating.

They are using the video and others from local surveillance cameras to determine the identities of those behind the attack.