St. Joseph, MO - An 11-year-old girl may be facing criminal assault charges, and the St. Joseph School District has launched an independent investigation after a video started circulating online of an alleged attack on an elementary school playground.The district said Monday it is treating the incident as an assault not just school yard bullying.“Even though it happened on the weekend, after-hours, but they were our students. They happened on our school grounds," Solon Haynes, Director of Student Services at St. Joseph Schools, said. "It was affecting our schools. It was brought back into our schools, so we felt we needed to address that issue.”St. Joseph police arrested the fifth grade girl last week. The school district launched its own investigation to determine what to do with the children involved.“If a student is charged with some type of crime, such as assault or selling drugs or rape or something of that nature, then we can suspend students up to 180 days or expel them from school,” Haynes said.The mother of the girl police arrested didn’t answer the door Monday afternoon.The girl's father, Dennis Roberman, told 41 Action News he lives in Texas and said he attempted to gain custody of her. Roberman said he watched the video but wanted to hold out judgment.“I know my child is 11 years old. I've seen an edited video posted. People are starting to text me and call me and all these other things, but I do hope the other little lady is ok, but until I hear from my daughter I can't really know what is going on,” Roberman said.The district also said not all of the children in the video attended St. Joseph schools, so they are working with other districts in those cases.Police said the incident is still under investigation.