We had a moron put one of those against the portable building that was my English/History class in 9th grade. That was as far as possible from the stadium, and set off during a game, so they were lucky anyone even heard it.
Made a 3' or so hole, he was locked up, end of drama.
I'm just thankful he set it off when the school was empty, since it was only about 2' from my desk that the hole was.
That was in W'ford... ohhh 1995-96...
We had a bomb threat or three in Arlington schools too... everybody out... turned out to be a joke, but better safe than sorry.
Glad to hear that none of yours were hurt, and I hope they lock that moron up... no pleas, no OhPoorMe it isn't my fault... he could have killed, multiple people, innocent bystanders... charge him with domestic terrorism and throw away the key... maybe it'll stop future morons from thinking crap like this is a good idea.