PORN shown to 11-year-olds in art class after older pupils set it up as a prank Year 7 pupils saw images on screen as they arrived for an art class Two Year 11 pupils later admitted to breaking anti-porn filters as a prank Teacher had left the room but shut down the porn as soon as she returned A headmaster has apologised after a class of 11-year-old pupils were accidentally shown porn on their classroom projector. The Year 7 pupils saw the images beamed on to a cinema-style screen as they arrived to class for an art lesson after older pupils broke anti-porn filters and left the images on the screen. The teacher had left the room for several minutes but left her laptop connected to the projector. She shut down the pornography as soon as she returned to class. A headmaster has apologised after Year 7 pupils were accidentally shown porn on their classroom projector at Tiverton High School, in Devon (pictured) Two Year 11 pupils later admitted to breaking the school's anti-porn filters and leaving the images on screen for a prank. But the incident at Tiverton High School, in Devon, upset parents and one family refused to let their child return to classes the next day. The school, a specialist visual arts college, uses a regional internet filtering system known as South West Grid for Learning to block porn and other prohibited websites. But headteacher Andrew Lovett said determined students would always find a way to pull pranks on their teachers. He said: 'We take eSafety very seriously at Tiverton High School and indeed the recent OFSTED report stated that students are well informed about how to keep themselves safe online. Our welfare team is well trained in eSafety matters and are always on hand to help any students who feel they have been affected by any online issues. The school, a specialist visual arts college, uses a regional internet filtering system known as South West Grid for Learning to block porn and other prohibited websites We have robust safety-nets and filters on our school internet connections. South West Grid For Learning provide this system for all Devon schools and they continuously monitor and update their lists of sites and content for filtering. Unfortunately teenagers have always been experts at finding ways around barriers, both in the physical world and online, and regrettably instances of that can have serious repercussions, as in this instance. Mr Lovett said the images involved were not of a 'depraved nature' and said the teacher removed them from the projector screen as soon as she re-entered the room. A member of the school's IT team was then asked to give a talk on internet safety. The two pupils who admitted the prank spent the day having what the school described as 'restorative conversations' with staff members 'whose trust they breached'. Mr Lovett, who has been in charge of the 1,300-pupil school since 2004, added: 'In this day and age internet safety is a big issue. The teacher spoke to them about the importance of reporting things that are inappropriate online. We also contacted all the parents and explained what had happened.