A video released by transit police in Philadelphia shows at least eight teens apparently attacking two helpless victims at a busy subway stop last week.

The 38-second clip begins with one student surrounded by a group of several teens taking turns kicking and punching him in the head and back as he cowers and lies defenseless on the floor at the Race and Vine streets station on the Broad Street Line at about 3:40 p.m. Thursday.

At least one other student is pummeled by another set of three teenagers, who stomp and punch the victim relentlessly as others look on before one teen rifles through his pockets, the video shows.

Authorities said the melee began as a snowball fight but turned violent in the subway station, where students from the String Theory School were targeted — prompting several frightened commuters to stop and record the brawl, Fox 29 reports.

“I have to tell you, this is becoming a daily event, throughout the city, either street corners or outside schools or on the SEPTA system,” SEPTA Police Chief Thomas Nestel told the news station.

Three people suffered minor injuries and transit officials want to speak with eight people in the video as they try to determine what sparked the violence.

No arrests had been made as of Monday, SEPTA spokeswoman Heather Redfern told The Post. Anyone with information about the incident is asked to call police at (215) 580-8111.