PITTSBURGH -- More than a dozen girls started fistfighting after an early dismissal on the last day of classes Monday at Peabody High School, WTAE's Jon Greiner reported.

Action News obtained a copy of a videotape of the altercation, which started on school grounds around 10:30 a.m. and continued on the streets of East Liberty. The student who shot the footage said she wasn't in school that day, but went there when classes let out because she and others had heard there would be fights.

Click here to see exclusive home video of the brawl.

Click here to view images from the fight.

One girl was arrested for disorderly conduct and another was cited for failing to disperse. Four boys who never threw a punch were also cited for failing to disperse.

Robert Fadzen, chief of safety for Pittsburgh Public Schools, denied that administrators knew the fighting was planned.

"We had no indications whatsoever from our side or the Pittsburgh Police side," said Fadzen. "We deal with information like that on almost a daily basis. It kind of caught us off-guard because we have had no problems there. It's been a very, very quiet year at Peabody."

But students said it has become somewhat of a tradition for girls to settle their differences this way. They said it was well-known that the violence was being planned.

"People knew this was coming because it almost happened on Friday. They should have known that it was going to be the last day of school and there was going to be fighting everywhere," student Marcie Rucker said.

"There were students talking the whole year about their enemies and how they're going to fight. It happens every year," said another girl, who didn't want to be identified. "They're going to fight at the end of the year, and they just fought today."

Fadzen said that's simply not true.

"The biggest things we've had as an end-of-the-year tradition was water balloons and squirt guns," he said. "We've never had that (fighting). I have been here nine years now and I have never seen that."

Fadzen said the incident was merely some enthusiasm about the summer break that got out of hand.

The school district issued a statement titled "Peabody Incident Blown Way Out Of Proportion," which says that no one was injured, no weapons were used and police were only called as a preventive measure. The statement called the fights "minor skirmishes."