Philadelphia police say it happened late Tuesday afternoon in Strawberry Mansion.
The victim is a 17-year-old girl. She and two other teen girls were assaulted by a group of 5-6 others in the 3100 block of Ridge Avenue.
Then, as surveillance video shows, the altercation spilled inside a store.
That’s when police say one of the “suspects, who is pregnant, pulled a knife, stabbing the victim in the left forearm.”
Afterward, the attackers escaped in an unknown direction.
The victim was taken to the hospital, where she was treated for her injuries and released.
The stabber is described as 15-16 years old, with a light complexion and thin build. She was wearing a pink head wrap, green 3/4 length coat, and had a blue purse.