WATCH: American teacher faces charges after video shows her dragging 9-year-old boy with autism

This is not an easy watch.

A primary school teacher in Kentucky in America has been removed from her school and faces charges of assault after she was seen on video dragging a student with autism down a hallway.

Angel Nelson, the boy in question's mother, told NBC News that her 9-year-old son, who attended Wurtland Elementary school in Greenup County, was diagnosed with autism, ADHD, PTSD, anxiety and depression. She also said that the child has limited speech.

Nelson said: "When you send your child to school you want them to be safe. The teacher is the farthest thing you should worry about."

You can see the clip of the boy being dragged around here, as well as a short interview with his mother: https://www.youtube.com/watch?v=_orz8fLIhcE Clip via NBC News

Nelson also said that she was told that her son was doing schoolwork in his classroom when his third-grade teacher "wanted him to do more."

"He needed a break and they kept pushing him to do more," she said. When the teacher felt that the son started "having an outburst," a teacher grabbed him by the wrists and dragged him out of the room, the mother said.

She said she learned of the incident hours later when the school called her.

“I worry about him because he does lack speech, and sometimes he can’t express how he’s feeling,” Nelson said. “He doesn’t understand why she did what he did.”