Three schoolgirls charged over a shocking assault on another student are alleged to have launched the same mob attack twice before, it has been revealed. ​

And the victim behind the most recent incident - which was filmed by onlookers - said she didn't know the girls who allegedly unleashed a flurry of punches and kicks that brought her to the ground.

Speaking to 7 News Perth the young Geraldton schoolgirl said she had no idea why she was singled out in the attack last Friday, but says she feels sorry for them.

When asked ​if she knew them she said:

“No I don't. I now do, but when it was happening, no.​

​"It's very wrong, it should never have happened and I feel bad for the people that did it."

The young victim needed hospital treatment and three teenage girls have since been charged over the seemingly unprovoked ambush.​

​Reliving the onslaught the victim's father was brought to tears today as he watched the footage back.

"Pretty disgraceful,” he told 7 News Perth

“And I'm really disappointed as a father and a member of the Geraldton community."​

A senior police officer yesterday described it as a pack attack and said it was one of the worst he had seen in 30 years in the force.​

​And since the incident was aired police say two other victims have made allegations against the trio - who have now been charged over those alleged attacks too.​