I know Parisian are very disappointed, and I feel for them.
I was surprised Notre-Dame Cathedral caught fire. As this cathedral is my most favourite place in Paris, I never go to Paris without visiting there (Please check 2010, 2013, 2015, 2018, 2019). I hope the damage will not expand anymore.
¶A massive fire consumed Notre-Dame Cathedral on Monday, gutting the roof of the Paris landmark and stunning France and the world, but firefighters managed to save the shell of the stone structure and its two main bell towers from collapse. […] Full text is here. Referenced from Reuters, 15 April, 2019