Police are looking for the man who punched a New York traffic agent unconscious after getting a parking ticket Wednesday.

Shocking video shows the moment the suspect approaches the agent from behind and punches him in the neck, knocking him to the ground.

The 50-year-old unidentified traffic agent was taken to Staten Island University Hospital and treated for a head injury and a bruise on his neck, police said.

Police are looking for this man who punched a New York traffic agent after getting a ticket

The attacker is seen in the video sneaking up behind the agent and punching him in the throat

The suspect is believed to be in his 20s and was last seen in a black t-shirt and gray pants.

His face is clearly visible in the surveillance camera video as he walks down the sidewalk on the phone.

He then crosses the street to where the agent is, sneaks behind him before delivering the blow and running away.

The agent was left in the middle of the street unconscious.

It's unclear if the victim was the one who had given the attacker the ticket and when it was issued.

Anyone with information is asked to call Crime Stoppers at 1-800-577-TIPS.