A wiring short took out a large section of the collider track.
Knowing Al Qaeda- they probably think they can use the collider to open a gateway into Hell. Er, they can’t, can they?
The reverse -- absence of a short. Not an open circuit, but one that had abnormally high resistance, leading to heat, leading to a helium leak, leading to loss of superconductivity, leading to even higher resistance and more heat ...
It's supposed to be firing up again in the next few weeks.