Cincinnati police are investigating after a young student was injured at Roll Hill School Tuesday. Police are investigating allegations that a substitute teacher assaulted a fifth-grade boy. The boy's family said it happened around breakfast time at the school and that the student's homeroom teacher witnessed the incident and stepped in to help. Cincinnati police tell WLWT the school called the school resource officer, who was not on campus at the time, to investigate after the incident.According to the boy's mom, the child, who WLWT is only identifying by his first name Mitchell, is wearing a neck brace and has a follow-up appointment with a doctor next week. "I think he didn't know how to calm down the class and he was mad, and he took it out on me," the student said. "He grabbed my arm, but he was squeezing my arm and told me to go sit down. He slammed my head to the wall and that's when the teacher stepped between us."There, Mitchell is referring to his homeroom teacher who he said stopped the altercation and got the principal involved. "If it wasn't for her, I don't even think Mitchell's story would even be heard because it would be his word against their word," said Jamie Coleman, Mitchell's mother.Coleman got a call from the school principal late Tuesday morning."She stated 'Mrs. Coleman, I have your son in the office. He's not in any trouble.' She said 'but I just wanted to let you know that he was mugged by a teacher.' And I was like 'mugged?'" Coleman said. "And she said 'yes, he was mugged by a teacher, and another teacher had to step in to intervene.'"When she asked her son what exactly happened, he explained the teacher grabbed his face with an open hand and hit his head into the wall. Coleman said her son complained of head and neck pain at home so she took him to Children's emergency room. His X-rays showed no broken bones, but Coleman said doctors advised him to wear a neck brace for at least the next week until his follow up appointment.A spokeswoman for Cincinnati Public Schools said the substitute teacher is not teaching while police investigate. The district released the following statement to WLWT: "On Tuesday, Cincinnati Public Schools received a report that a substitute teacher was involved in a physical altercation with a student at Roll Hill School. A staff member intervened to break up the incident. The student was examined by the nurse and there were no apparent injuries requiring medical attention. CPS informed the parent about the incident and reported it to the Cincinnati Police Department. The substitute teacher was removed from the classroom, pending the results of an investigation. CPS learned today the parent took their child for an additional medical evaluation. We take these allegations very seriously, and are cooperating with CPD during their investigation."The police investigation is ongoing. So far no charges have been filed.