Electronic Steering Interlock.
	
	
		Most modern cars are like this.
The steering lock is indeed electronically/electrically engaged and disengaged.
You'll notice a click when the key is inserted into the ignition, or the fob, or you've got close enough to the antenna to trigger it. It all differs a little by manufacturer.
The security module dialogues with the key to ensure that they match before unlocking the steering and all the rest. Now, given that all of this electronic dialogue is necessary to ensure the vehicle immobiliser will allow it to be started, the automatic transmission placed in gear and the like, just why the hell do we need a steering lock anymore? 
As we have all just noticed this is a VERY BAD THING when there is a complete power failure in the vehicle.
Back in the bad old days all it took was a turn of the key to physically unlock the steering. Before that who needed to worry anyway.
As others have correctly pointed out. Modern cars have become far too clever by half. Too clever for their own and OUR good.
I'm glad no-one was injured in this incident but things like this really do need to be fed back strongly to car makers that there are some very big holes in the actual safety of these vehicles. Seat belts, airbags and the like are wonderful things when the vehicle is subjected to outside trauma but how safe are they when they turn on themselves.
Well those are my thoughts anyway.
Glad it had a happy(ish) ending Drivesafe but I fairly cringe when I think about the potential.
As an aside would like to know the root cause of this and would be very interested if you choose to share when it is discovered.
Iain