A group of parents say their children with disabilities experienced “waterboarding-like torture” and other forms of abuse at the hands of two teacher’s aides at a Montana middle school.

Now, the teacher’s aides, Julie Parish and Kristina Marie Kallies, face felony charges of assault on a minor and endangering the welfare of children in connection with the alleged abuse in a special education classroom.

Witnesses say that students were subjected to water torture and forced to eat their own vomit. Further, parents say they suspect students were also confined to closets.

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Parents noticed that students came home with bruises, bite marks, burnt fingertips and missing hair.

The students, who have a variety of disabilities including autism, Down syndrome and cerebral palsy, were unable to speak up about the problems due to their disabilities.

Both Parish and Kallies have resigned. If convicted, they face up to five and half years in prison, reports KFBB, the Helena, Mont. ABC affiliate.