Idiots.

From CBC News:

While the fire didn't cause any significant damage, the fire extinguisher used to douse the flames left many books and parts of the floor covered in residue.

Two 12-year-old boys have been charged with arson.

Fire officials say it's believed a paper cup was lit on fire and dropped through the book return slot.

I say:  Bring back the stocks in the town square!

(We watched the first disc of The Office (Season Two) last night.  I think that Dwight might be rubbing off on me.  Which is a little frightening.)