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Three students have been excluded from Pukekohe High School following an alleged incident in which a classmate was held down and assaulted in front of his classmates.
Principal Ian McKinnon said the Year 10 boys were suspended for gross misconduct two days after the incident, which happened a week and a half ago and during a break.
They have since gone before the Board of Trustees and been excluded from the school.
Exclusions apply when students are under the age of 16, with the requirement they enroll elsewhere.
Students over the age of 16 can be expelled but don't have to be enrolled elsewhere.
The assaulted student has not yet returned to school.
In a letter sent home to parents Mr McKinnon said police were immediately informed and are now investigating the assault which was witnessed by numerous other students.
Mr McKinnon described the assault as a "serious incident" and said reactions to such an event will be "varied and can include intense feelings of shock, guilt, anger, anxiety, or denial".
"As a school we have a responsibility to provide support and assistance for those who need it and allay any concerns that may exist".
Mr McKinnon said the school was working closely with police, sought advice from the Ministry of Education, involving guidance counsellors and discussing the incident with students.
"Appropriate support and guidance will be offered at every stage of dealing with this issue."