(KYW-TV) Authorities are investigating a SEPTA subway station beating.
Police say students were involved in the attack.
SEPTA police call the video "horrifying" and say despite the violence, it all could have been much worse.
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A video from a SEPTA security camera rolling around 315 p.m. Tuesday at the Spring Garden subway stop along the Broad Street Line shows the brawl.
It starts calmly enough and then chaos.