Surveillance cameras captured an unidentified teenager viciously sucker punching an English teacher from the Pittsburgh High School for the Creative and Performing Arts in a downtown alley last Thursday.

Police told WTAE they are looking for the person who attacked James Addlespurger, 50.

In the video, Addlespurger can be seen walking by a group of teenagers holding a bag when one of the boys suddenly strikes him in the face.The punch sends Addlespurger to the ground, causing him to hit his head on the concrete. The teenagers then walk away as if nothing had happened.

At least three good Samaritans rushed to help Addlespurger, including a woman who witnessed the attack, the Pittsburgh-Post Gazette reports.

Video Shows Teen Viciously Sucker Punching High School Teacher James Addlespurger

(WTAE)

Video Shows Teen Viciously Sucker Punching High School Teacher James Addlespurger

(WTAE)

Video Shows Teen Viciously Sucker Punching High School Teacher James Addlespurger

(WTAE)

WTAE, citing police, reports that Addlespurger teaches 10th and 12th grade English at the Pittsburgh High School for the Creative and Performing Arts. He was reportedly recovering from the incident at his home.

Because the attacker has not been identified yet, motive for the attack is still unclear.

However, the New York Daily News reports that investigators have identified three of the six teens seen on the surveillance video. They are still searching for the person who hit the teacher.

The Daily News has more:

That teen “definitely went out of his way” to hit Addlespurger, said Pittsburgh Police Detective Al Flemm, who noted that he wasn’t even the closest to the Pittsburgh High School for the Creative and Performing Arts educator at the time.

Addlespurger said he didn’t recognize any of the kids in the group.