They are reporting now that there are 400 fire fighters on scene and some have gotten up on one of the towers and can direct water into the interior.They’re reporting that’s they aren’t dropping water on the blaze (as with forest fires) because the weight of the dropped water would destroy what’s left.
The French Interior Dept spokesman is saying they may not be able to save the building.
If it is still standing in morning I'd bet it will be gutted and only be torn down. I'd guess the interior wood frame will be not be salvageable.