Better put your tinfoil hat on!
I already have mine - it wouldn't take much sabotage work to have this happen. I'd imagine the tolerances are pretty tight. Cyrano (husband) here theorizes something as simple as loosening a screw a couple turns could conceiveably cause trouble. Just screw something up on a system that takes a lot of stress coming back in, and that would be that.
And if you planted some kind of explosive (which would probably be traceable eventually) you could trigger it by radio frequency whenever you wanted to.
just thinking out loud... I don't have any leanings one way or another, but sabotage isn't something that would surprise me at all.
According to NASA, this was exactly when the shuttle disintegrated.
Only thing is, you'd have to have a guy named Abdullah who works at KSC and could plant it ahead of time - and I know their security is pretty tight.
Just wait for the Islamofascist conspiracy line that the Israeli astronaut did it.