It was around 8:20 a.m. when officers arrived at the school on West Hunting Park Avenue in the Tioga-Nicetown section.
The CEO of Mastery, Scott Gordon, explained that two students involved were enrolled in the Mastery Alternative Pupil Support program for severely emotionally disturbed youth.
School officials say a 17-year-old boy initiated a fight with a girl in the hallway right outside a classroom. Gordon says the program director immediately stepped in.
"The student who initiated was, per our protocol, arrested. A student who was elbowed in stomach, per our protocol - we contacted an ambulance to make sure they were okay," said Gordon.
The program director fell in the course of breaking up the fight but did not require medical attention.? The program operates out of the Simon Gratz High School building but is separate from Gratz High School, though both are run by Mastery.
Chopper 6 HD was overhead as police and medics went into the building. One person could be seen being brought to an ambulance in a wheelchair.
Parents and other relatives were outside the school trying to figure out what was going on.
"I'm thinking there's something going on at the school where my nieces and nephews attend, so I ran up here," said Shantay Cooper.
While the boy who initiated the fight was turned over to police, it is unclear if he will face any charges.