City and SEPTA police had to break up a melee between 100 charter high school students at the 8th Street Market-Frankford El station in Center City Philadelphia on Friday morning.
The fight started on the westbound platform just before noon among students from the Charter High School for Architecture and Design, SEPTA and police said.
As SEPTA officers worked to break up the fight, the students began attacking them, officials said.
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Police called for backup and some 50 officers flooded the station at 8th and Market streets.
Three students were arrested and the others were ushered out of the station, police said.
No one was injured.