By Alicia Nieves and David Spunt

PHILADELPHIA (CBS)—Germantown residents are outraged after video shows a group of kids attacking a man who police say is mentally challenged.

READ MORE: Sharon Hill Police Officers Charged With Manslaughter In Fatal Shooting Of 8-Year-Old Fanta Bility

Authorities in Philadelphia discovered the video on Monday night after it surfaced on Facebook.

On Tuesday, police say they arrested four of the individuals seen punching the man and laughing–even clapping at whole ordeal.

“There’s no rhyme or reason. It appears, One could think it’s for kicks and giggles by sick minded people in this case juveniles,” said police

Charges of aggravated assault, simple assault, and reckless endangerment are pending against all the juveniles involved in this attack.

Now authorities are connecting some of the teens in the video to another attack in Germantown that left a principal injured.

READ MORE: Flyers Drop 9th Straight Game After Blowing Late Third-Period Lead To Islanders

“There are some individuals that involved in this incident are also involved in that incident,” police said. “We are looking at similarities with this incident, relating to the assault on the principal.

Philly Principal Attacked With Brick During After School Brawl

In that incident, official say the principal at Edwin Fitler Elementary School was attempting to break up a fight when he was attack with a brick .

“They kept coming up towards him. I mean what was he supposed to do? Leave his children? No principal is going to leave his children in harms way. You go down with your ship,” said Dr. Robin Cooper, president of Commonwealth Association of School Administrators Local 502.

The principal is recovering  after receiving eight stitches to the eye.

MORE NEWS: 'Water Was Completely Above The Ceiling': Queen Village Businesses Still Struggling After July Water Main Break

Anyone with information on either incident is asked to call police at 215-686-TIPS.