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A Baltimore tutor is being investigated by police after a 7-year-old boy in his care suffered a fractured jaw and two missing teeth after the tutor allegedly threw the boy against a wall for misbehaving.

“I looked in the ambulance and there’s my son, his face big, mouth bloody. I turned to the man, ‘I said, ‘This isn’t regular restraint,” Lateekqua Jackson, mother of Trayvon Grayson, told CNN affiiliate WBFF.

The tutor claimed that he took the boy out of the classroom because he was misbehaving and that Trayvon “hit himself” on the wall, but his mother isn’t buying it.

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“He can’t throw himself into the wall and fracture his jaw and lose his teeth,” she said. “He’s only 7 years old. He’s so small he’s not going to do the damage to himself.”

Larry Schugam, the executive vice president for the Baltimore Curriculum Project, said that he felt “heartsick” over the incident.

“This is an unusual, isolated incident for our schools, and we are participating in a thorough investigation into what exactly happened,” Schugam told CNN. “Until that investigation is complete, the one employee involved has been suspended.”

The Baltimore City Public Schools said that it “will take any action warranted once the investigation is complete.”