A schoolgirl was injured after pranksters left extra-strong glue on a toilet seat.

It is understood the 13-year-old victim suffered torn skin as she stood up from the seat.

The victim was seen later by her family doctor and while her injuries were not considered serious, the girl was deeply upset.

Education chiefs, preparing for the launch of National Anti-Bullying Week, stressed this was a "stupid prank" aimed at no one in particular.

A spokesman for West Sussex County Council education authority said: "This was not bullying but we are treating the incident very seriously and an investigation is under way to identify who was responsible."

The incident happened at Angmering School in Station Road, Angmering, Littlehampton.

The education authority said neither the school nor the victim's parents wanted to speak about the incident.

The spokesman said: "We can confirm that an incident involving a pupil and super glue (sic) occurred at The Angmering School last week.

"We have told all pupils this was totally unacceptable behaviour and they have been warned about the dangers of such conduct."

The spokesman said the matter was being handled by the school. He said: "It was the parents' choice not to involve the police.

"The girl's injuries were not severe and she did not go to hospital. She was seen by her GP."

The incident happened just days before Professor Al Aynsley-Green, children's commissioner for England, said almost every child was growing up in a society that saw violence as "the norm".

He said yesterday that schools were facing an epidemic of bullying.

He plans to use Anti-Bullying Week to ask the Government to compel schools to give children questionnaires on the issue every term.

Both East and West Sussex education authorities are launching anti-bullying events.

Turning The Tide, a 30-minute theatre production which looks at the impact of bullying and how it can be tackled, will tour West Sussex between November 14 and December 2.

The tour has been organised by Action Against Bullying (AAB), a multi-agency group set up in 1999 by West Sussex County Council's community safety team following a survey that showed bullying was a high-priority issue for young people across the county.

Turning The Tide will be performed by the Youth Theatre Group based at Chichester Festival Theatre.

The ABA will also be holding a number of conferences during the week, including one at Westminster and a regional one at Brighton.

This will be attended by representatives from West Sussex and will include a performance of Turning The Tide.

During the week, AAB will also be consulting with young people on its anti-bullying card, a durable credit card-sized information sheet.

Plans are under way to distribute them to every child in the county in Years Three to 11 in the spring.

Children and young people, or their parents or carers can find further support and information on the issue of bullying at www.anti-bullyingalliance.org