By . Leon Watson and Andy Dolan . PUBLISHED: . 08:55 EST, 11 March 2013 . | . UPDATED: . 04:13 EST, 12 March 2013 . A teenager who plotted to massacre his classmates in revenge for being bullied was thwarted by the FBI after agents received a tip off from a concerned internet chat-room user in America. The 16-year-old, from Northamptonshire,  kept a stockpile of explosives, became ‘fascinated’ by mass killings and drew up a hit-list of his fellow students - including detailed blueprints of where they sat. But when he bragged on web chat site Omegle that 'twenty minutes from now he would be armed with a Magnum .44 . revolver, a Beretta 92FS and various other weapons', one worried user across the Atlantic raised the alarm. He was arrested after boasting anonymously to the American that he would keep shooting until his classmates were wiped out or the police arrived before killing himself, Birmingham Crown Court heard. The American user alerted the FBI who immediately contacted UK police. 'I'll be ready in 20 minutes': He was arrested after boasting anonymously to a fellow user of chat room Omegle. The American user alerted the FBI who raised the alarm with UK police . Prosecutor . Mark Topping told the court: 'The boy told the person he was going to stage a massacre at his school using handguns then committing suicide. 'He said he would keep shooting until . the police arrived, at which point he would commit suicide. He also . made a comment about how people shouldn't have bullied him so much.' At . his house, police found explosive chemicals bought online with his . father’s PayPal account, plans of his school, terrorist e-books and . manuals on how to construct a bomb. Following . his arrest last February, the teenager was transferred to a secure . mental unit and has since been diagnosed with Asperger’s  syndrome, . which Birmingham Youth Court heard ‘severely limits his ability to . relate to others’. When police searched his home in . Northamptonshire they also found chemicals used to make explosives which . had been bought from the internet. Raising concern: Birmingham Crown Court heard how the boy boasted on the chat room that in 'twenty minutes from now' he would be armed with a Magnum .44 revolver, a Beretta 92FS and various other weapons (picture posed by model) 'The boy also posted pictures of himself - some holding weapons which he uploaded to the website. In others pieces of paper were being held up with comments relating to a high school massacre.' The boy pleaded guilty to one charge of possessing explosive materials and one charge of possessing terrorist materials. 'There were plans of class rooms, desks at which pupils sat and who was to be targeted. It . is interspersed with references to [the boy] feeling himself to be weak . and powerless, excluded from social activities and being bullied.' Prosecutor Mark Topping . He also admitted a third charge of possessing 'Lollicon' images - Japanese cartoons depicting child sex abuse. Mr Topping added that the boy had been arrested on February 26 before being transferred to a secure mental unit. He said: 'He told both his carers and the police he had the desire to carry out a mass killing. Because . he suffers from severe Asperger's syndrome the assessment was that he . may carry out such an attack if he was given the means to do so. 'His condition causes him to be less inhibited and severely limits his ability to relate to others.' A police search of the boy's home . found twenty publications, including 'The Terrorist Handbook', 'The CIA . Explosives for Sabotage Manual' and bomb-making guide 'An Anarchist's . Cookbook - Recipes for Disaster'. The court heard that police also . found diaries and hand-written notes containing detailed plans for the . planned high-school massacre and research on 'Lone Wolf' killers . including Black Panther Donald Nielsen. A 16-year-old boy appeared at Birmingham Magistrates' Court and admitted possessing explosive chemicals and bomb-making books and diagrams . Mr Topping added: 'He spent some time . looking for this material and wrote out a quotation on a notice board . at school which was quickly erased. 'The recoveries included diaries and notebook instructions for the construction of IEDs. There were further notes about plans for the massacre. 'There were plans of class rooms, desks at which pupils sat and who was to be targeted. It . is interspersed with references to [the boy] feeling himself to be weak . and powerless, excluded from social activities and being bullied.' Officers also found sealed containers . of potassium nitrate and sulphur powder - 'precursor chemicals' for . gunpowder - which the boy had bought online using his father's PayPal . account. Giving evidence, the boy's . psychiatrist said he believed the massacre plans had been a 'fantasy', . and that his disorder caused him to obsess over his interests. Consultant Dr John O'Brien said the boy had developed a fascination with school shootings and serial killers. He said: 'He has said in hospital . that although he knew it was a crime and was wrong and would result in . his arrest, it was part of a fantasy to deal with his interest in serial . killers and school shootings and he didn't intend to carry it out. 'He has talked about this in a . fantasy-type way, and has said he never planned for it to be real life . and he didn't have plans to carry it out.' Imposing a hospital order, District . Judge Howard Riddle said he had been persuaded by expert evidence that . imposing a hospital order was the best course of action. He said: 'I have been helped, as have . you, by very real expert assistance both from the lawyers and of course . from your doctors. It gives us all some cause for hope in this case.'
Boy from Northamptonshire will be detained indefinitely .
He boasted of his detailed plot on chat room Omegle .
He said he could be ready to enact plan in 20 minutes .
A concerned American web user alerted the FBI .
Teen also had a host of bomb-making literature .
Among texts he had were 'The Terrorist Handbook'
By . Leon Watson and Andy Dolan . PUBLISHED: . 08:55 EST, 11 March 2013 . | . UPDATED: . 04:13 EST, 12 March 2013 . A teenager who plotted to massacre his classmates in revenge for being bullied was thwarted by the FBI after agents received a tip off from a concerned internet chat-room user in America. The 16-year-old, from Northamptonshire,  kept a stockpile of explosives, became ‘fascinated’ by mass killings and drew up a hit-list of his fellow students - including detailed blueprints of where they sat. But when he bragged on web chat site Omegle that 'twenty minutes from now he would be armed with a Magnum .44 . revolver, a Beretta 92FS and various other weapons', one worried user across the Atlantic raised the alarm. He was arrested after boasting anonymously to the American that he would keep shooting until his classmates were wiped out or the police arrived before killing himself, Birmingham Crown Court heard. The American user alerted the FBI who immediately contacted UK police. 'I'll be ready in 20 minutes': He was arrested after boasting anonymously to a fellow user of chat room Omegle. The American user alerted the FBI who raised the alarm with UK police . Prosecutor . Mark Topping told the court: 'The boy told the person he was going to stage a massacre at his school using handguns then committing suicide. 'He said he would keep shooting until . the police arrived, at which point he would commit suicide. He also . made a comment about how people shouldn't have bullied him so much.' At . his house, police found explosive chemicals bought online with his . father’s PayPal account, plans of his school, terrorist e-books and . manuals on how to construct a bomb. Following . his arrest last February, the teenager was transferred to a secure . mental unit and has since been diagnosed with Asperger’s  syndrome, . which Birmingham Youth Court heard ‘severely limits his ability to . relate to others’. When police searched his home in . Northamptonshire they also found chemicals used to make explosives which . had been bought from the internet. Raising concern: Birmingham Crown Court heard how the boy boasted on the chat room that in 'twenty minutes from now' he would be armed with a Magnum .44 revolver, a Beretta 92FS and various other weapons (picture posed by model) 'The boy also posted pictures of himself - some holding weapons which he uploaded to the website. In others pieces of paper were being held up with comments relating to a high school massacre.' The boy pleaded guilty to one charge of possessing explosive materials and one charge of possessing terrorist materials. 'There were plans of class rooms, desks at which pupils sat and who was to be targeted. It . is interspersed with references to [the boy] feeling himself to be weak . and powerless, excluded from social activities and being bullied.' Prosecutor Mark Topping . He also admitted a third charge of possessing 'Lollicon' images - Japanese cartoons depicting child sex abuse. Mr Topping added that the boy had been arrested on February 26 before being transferred to a secure mental unit. He said: 'He told both his carers and the police he had the desire to carry out a mass killing. Because . he suffers from severe Asperger's syndrome the assessment was that he . may carry out such an attack if he was given the means to do so. 'His condition causes him to be less inhibited and severely limits his ability to relate to others.' A police search of the boy's home . found twenty publications, including 'The Terrorist Handbook', 'The CIA . Explosives for Sabotage Manual' and bomb-making guide 'An Anarchist's . Cookbook - Recipes for Disaster'. The court heard that police also . found diaries and hand-written notes containing detailed plans for the . planned high-school massacre and research on 'Lone Wolf' killers . including Black Panther Donald Nielsen. A 16-year-old boy appeared at Birmingham Magistrates' Court and admitted possessing explosive chemicals and bomb-making books and diagrams . Mr Topping added: 'He spent some time . looking for this material and wrote out a quotation on a notice board . at school which was quickly erased. 'The recoveries included diaries and notebook instructions for the construction of IEDs. There were further notes about plans for the massacre. 'There were plans of class rooms, desks at which pupils sat and who was to be targeted. It . is interspersed with references to [the boy] feeling himself to be weak . and powerless, excluded from social activities and being bullied.' Officers also found sealed containers . of potassium nitrate and sulphur powder - 'precursor chemicals' for . gunpowder - which the boy had bought online using his father's PayPal . account. Giving evidence, the boy's . psychiatrist said he believed the massacre plans had been a 'fantasy', . and that his disorder caused him to obsess over his interests. Consultant Dr John O'Brien said the boy had developed a fascination with school shootings and serial killers. He said: 'He has said in hospital . that although he knew it was a crime and was wrong and would result in . his arrest, it was part of a fantasy to deal with his interest in serial . killers and school shootings and he didn't intend to carry it out. 'He has talked about this in a . fantasy-type way, and has said he never planned for it to be real life . and he didn't have plans to carry it out.' Imposing a hospital order, District . Judge Howard Riddle said he had been persuaded by expert evidence that . imposing a hospital order was the best course of action. He said: 'I have been helped, as have . you, by very real expert assistance both from the lawyers and of course . from your doctors. It gives us all some cause for hope in this case.'
American user alerted the FBI who immediately contacted UK police. 'I'll be ready in 20 anonymously to a fellow user of chat room Omegle. handguns then committing suicide. 'He said he home in . Northamptonshire they also found on the chat room that in 'twenty minutes from his carers and the police he had the desire to publications, including 'The Terrorist Handbook',