About 20 students broke out into "several small fights" inside the gymnasium at Perry Traditional Academy in Perry North this morning, a Pittsburgh Public Schools spokeswoman said.
Pittsburgh police aided school police at the high school on Perrysville Avenue about 10 a.m.
Investigators initially suspected the fight started because people were upset about an incident in Northview Heights in which a 16-year-old was jumped while trying to help his 12-year-old brother, who was being chased by about 10 teenagers, according to accounts from the district and police.
But Pittsburgh Public Schools spokeswoman Ebony Pugh said this evening that school police have now determined that a different incident -- an argument that happened around dismissal time Wednesday and was easily broken up -- might have provided the impetus for this morning's melee.
Ms. Pugh said both male and female students were involved in this morning's fight. One male student punched a window and was taken to a hospital for treatment, Ms. Pugh said.
School police, she said, are "still investigating and trying to determine the identity of those involved."
Ms. Pugh said city police were present at the school for dismissal this afternoon "just to make sure that nothing else occurs."
First Published December 5, 2013 11:52 AM