Warning: Some may find the video disturbing. HARTFORD — A juvenile is under arrest after a video showed a surprise attack on a man in Hartford also known...

Warning: Some may find the video disturbing.

HARTFORD -- A juvenile is under arrest after a video showed a surprise attack on a man in Hartford also known as the "knockout game."

A 66-year-old man was walking outside of his home, when he was approached by four teens, police said. One of the teens punched the man in the back of the head, shoved him to the ground and threw him into the street. One teen filmed the attack on his phone and two others watched. They can be heard laughing as the man lies in the road.

The victim said he wasn't seriously injured and got a bump on the back of his head and a headache. He didn't call police or seek medical attention.

Police said the video quickly made the rounds at Hartford High School where the attacker goes to school. That's when school district officials caught wind of it and reported it to authorities.

Police said the teen was arrested and referred to juvenile court Tuesday, May 10. He was issued summons for assault in the third degree on an elderly person, reckless endangerment in the second degree and disorderly conduct. He has a previous arrest record, according to police, and just a week prior was arrested after a fight at his school.

No word yet if the other teens in the video will face charges.

According to police, when the teen was visited at his home by officers he claimed the victim was an old man and acting crazy and doing "karate stances," which the suspect said he thought meant he wanted to fight his friend. However, after police showed the suspect and his grandparents the video, the suspect got upset and exasperated.

According to police the victim is 5-foot-4 and 110 pounds, while the suspect is 5-foot-6, 140 pounds and muscular.