It happens all the time now too. My school has had two pipebombs, one knife, and a drugged-out kid going to war with a security guard. We get a letter home and nobody gives a fuck.
I almost wish the kids at my school were that sophisticated. The most serious assault I remember was with a bike pedal. Or crankshaft. Or some other bike part. Teachers get an e-mail when it happens, and then students get a vague letter home the next day. Most the time though, if kids fight with security (a monthly, if not weekly occurrence), it tends to be with fists. The SRO fired his Taser once, but it didn't deploy correctly or something like that. It's weird, because I know a ton of people have knives or even guns with them, but those people tend to not get in situations with security that they would use them. No bombs that I know of though, so that's a relief.