Ten years ago, two teenagers walked into a Colorado school and massacred 13 people. The killings sparked wall-to-wall media coverage around the world - much of which has since turned out to be nonsense. Andrew Gumbel, who reported on the aftermath, explains what really happened that day - and why

Medics tend to the wounded in the wake of the massacre. Photograph: Rodolfo Gonzalez/Associated Press
Exactly 10 years ago on Monday, the world woke up to learn that two more unhinged American teenage misfits had snapped after years of bullying at the hands of the "jocks", the sporting overlords of their universe, and gone on a murderous rampage with semi-automatic weapons through their suburban high school.
Or that's the version we were told, anyway.