Sorta on the same vien, so I decided to post here, rather than in a new thread.
Yesterday a seemingly similar thing at my own daughters school, was averted, luckily, due to the actions of some net users.
Although this lad didnt have a gun he did have a 5" blade, petrol, matches and apparently "compressed explosives", which my daughter said looked like lighter fluid.
In this
link it states that the boy like "gothic" music and "doom" style games, so that old chestnut.