A former teacher and two aides at a West Virginia school have been arrested after police said they were recorded abusing an autistic student.

The video came from a recording device Amber Pack hid in her daughter Adri's hair in October after the child came home from Berkeley Heights Elementary School in Martinsburg with bruises that appeared to be from tight grips, according to a complaint.

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In the recording, the teacher, Christina Lester, and the aides, Kristin Douty and June Yurish, threaten Adri and other students with physical violence, saying they would hit them in the face, knock out teeth or withhold food, the complaint alleges.

"These arrests send a strong message — that child abuse will not be tolerated and must be reported," West Virginia Attorney General Patrick Morrisey (R), who filed a civil lawsuit against the three in February, said in a statement. "We must continue working to ensure vulnerable children are protected, especially at school."

Morrisey made criminal referrals to the prosecutor as a result of the investigation, according to CNN, and the civil complaint was amended in May to include principal Amber Boeckmann and deputy county superintendent Margaret F. Kursey, claiming they “actively tried to obscure evidence with a flawed investigation.”

His office has also added the Berkeley County Board of Education, saying it “bears responsibility because those committing the allegations did so during the course of their employment with the board."

"We're pleased that the prosecutor took her time, did a thorough investigation and decided to arrest the three individuals this morning," the family's attorney Ben Salango told CNN. "We've had faith in the system from the beginning and look forward to a disposition of criminal proceedings."

The Hill has reached out to the board of education for comment. The school also referred all requests for comment to the board.