Grant Stranaghan (15) stayed away from school yesterday as a result of the sinister incident - which happened as he was travelling home on the school bus on Friday afternoon.

His father, George, took the decision to keep his son at home over concerns that his safety could not be guaranteed after the attack.

The schoolboy has become embroiled in a row which could have massive legal implications for schools across Northern Ireland.

Last month, he was given a three-day suspension from Ballyclare High School because his hair was two inches long. Since returning to school - over two weeks ago - the teenager has been kept isolated from his classmates.

Mr Stranaghan said: "We just aren't sleeping over all of this.

" Grant was sitting on the bus on Friday when he realised that someone was coming up behind him.

"He turned around and there was a boy there with a big pair of scissors. Grant was able to push him away but when you think what could have happened it's very worrying.

"If the bus driver had to brake - it was like coming at him with two big knives. We kept him away from school because we just don't know if he's safe or not."

The Belfast Telegraph revealed yesterday that Ballyclare High School - where Grant is a fifth year pupil - is seeking affirmation from the High Court that its actions have been legal.

A statement from the school said: "Ballyclare High School has begun legal proceedings to support its position regarding the case of a boy who was suspended for deliberately flouting school rules by refusing to have his long hair cut."

The school took the action after Mr Stranaghan said he intends to apply for leave for a judicial review into the matter and ask for his son to be allowed to return to class, claiming that he is suffering sexual discrimination, as well as a breach of his human rights.