A video showing a woman being attacked at a SEPTA station has sparked a police investigation.

The video, which was posted on YouTube Friday, shows a woman dressed in white punching and kicking a woman dressed in black at the 30th Street subway station.

The man who uploaded the video, who wanted to remain anonymous, told NBC10 he witnessed the assault last Monday around 7:50 p.m. According to the uploader, prior to the recorded attack, the woman in white was chasing another man through several cars on the Market-Frankford Line while threatening to stab him with “what looked like a homemade shiv.”

"Also at some point on the train he hit her when she was up in his face," the uploader said.

The uploader says the train conductor called police after the train stopped at 30th Street. The man who allegedly was being chased then sat down on a bench next to a woman dressed in black with a cast on her left arm. The woman in white then approached the man and the woman in black which is when the uploader began to record.

The video shows the woman in white screaming at the woman in black. The woman in white then repeatedly punches the woman in black in the face. The woman in white then throws the victim to the floor, grabs her hair and repeatedly kicks her in the face.

The man recording the attack yells for someone to stop the assault. The man who was sitting next to the victim then yells, “Don't stop s*** because this b**** is going to jail! I’ve got a restraining order on this b****!”

After the attack, the woman in white walks up a stairwell and leaves the scene.

“She can’t run, she’s drunk, what’s she gonna run to?” the man asks. “I’ve got a restraining order on her. She ain’t supposed to be the f*** around me.”

The uploader also told NBC10 he spotted the same attacker several days later on a SEPTA train though nothing happened.

A spokesman for SEPTA told NBC10 police are aware of the incident and are currently investigating. The spokesman also said that everyone involved in the incident knows each other and no one was seriously hurt. The spokesman did not confirm whether anyone has been charged but says the investigation is ongoing.

Warning: This video contains graphic language and violence