I cant think of any side that would do such a stuid dangerous thing (funny how emmidiatly some one would think of a side to blame)
Dave3,
Regrettably, these things are happening. There have been numerous cases of Oxy bottles being found discharged, and safety equipment being found vandalised. One of the worst was a used tampon being hidden in the flight deck. The poor sod who found it, during his security checks, has had to undergo an AIDS test.
Now, I leave it for all on here to wonder which side of the fence the perpetrators of these acts might sit. It's bizarre behaviour, though, as they will have no idea who their actions are going to affect. It could be one of their best mates, partner, or even themselves. Absolute idiots.