Education officials are investigating a claim by an 11-year-old boy with learning difficulties that a teacher taped his mouth to stop him talking in class.
Ben Deacy's mouth was allegedly taped to stop him talking
Ben Deacy alleges his mouth was taped during a lesson at Llanrumney High School, in Cardiff, last Thursday.
It is also claimed that the teacher involved in the incident wrote in a school report which the boy took home: "Excellent work - once I taped his mouth up!!"
The boy's mother, Kay Morgan, said the teacher's alleged actions were "stupid" and added that she was now keeping Ben, who cannot read or write, home from school.
Cardiff Council has confirmed that an investigation will be carried out.
The school's headmaster, Don Barnfield, told the South Wales Echo that the incident was a "grave error".
He is reported to have said: "What seems to have happened is
an inexperienced member of teaching staff has made a grave error. The pupil was talking a lot during the lesson and a piece of masking tape, a
very small piece, was put on his lips.
"It was just a symbolic piece, if you like, to make the point that he needed
to work quietly. It wasn't appropriate and goes against all our codes here in school.
"It was a very, very silly thing to do and I can understand Ben's family
being very upset by this.
"The tape wasn't put the long way over the mouth. It was a small piece going
from the top to the bottom lip and wasn't blocking his breathing.
"It was totally inappropriate and I will need to take appropriate action."
Ms Morgan, 45, said her son had become "a bit quieter" since the incident.
She claimed the tape had been placed across Ben's mouth and he had been taken to see a doctor after getting an allergic rash.
Ms Morgan added: "He wants to go back to school because he does like it, but
he doesn't want to see that teacher.
"If a parent had done that they would have the social services on to them.
"Ben has a tendency to talk a lot but to tape his mouth up is just wrong.
"No teacher should be doing things like that to children - especially children like Ben who have special needs.
"He brought his school report home at the end of the day and I couldn't believe my eyes."
Ms Morgan added that she would make a complaint to Llanrumney High School.
A statement released on behalf of Cardiff Council said: "Prompt and appropriate action was taken following existing procedures and relevant actions are now being considered.
"Investigations will be carried out but it would be inappropriate for us to comment further at this stage in accordance with clear procedure."
A South Wales Police spokesman said no official complaint had been made to them about the incident.