Update:
24 hours later, we can say this grandest of churches did not in fact burn to the ground.
All the wood in the roof above the stone vault was consumed, extremely old oak which was already hundreds of years old in 1160 when construction first began. And had not the heavy spire burned and broken through this stone vault, more of the interior had escaped the flames. As it was, some firefighters doused the interior at level as others attacked the roof fire from above and much was saved in the end, under very difficult circumstances.
Hundreds of millions of Euros have already been pledged for the full restoration of this cathedral, which is literally the center of France.
