In fact, the pair's suicidal attack was planned as a grand — if badly implemented — terrorist bombing that quickly devolved into a 49-minute shooting rampage when the bombs Harris built fizzled.
"He was so bad at wiring those bombs, apparently they weren't even close to working," says Dave Cullen, author of Columbine, a new account of the attack
http://history1900s.about.com/od/
this link is fairly true except for them being picked on
"You all better hide in your houses because I'm coming for EVERYONE soon, and i WILL be armed to the teeth and i WILL shoot to kill and i WILL KILL EVERYTHING!"
- Eric Harris, Journal Entry
Did his parents not once think of going through his room?