I have heard nothing about the parents of the responsible kids being held liable. I have no idea what the law is where this happened but when I was in law school, at least in Florida, parents were liable for the torts of their minor children and assault and battery is not only a crime but also a tort. The girls parents need to file a massive lawsuit against the parents of the perpetrators. Maybe if they knew they were liable for what their brats do they would actually do some parenting.