The loss of irreplaceable art and culture is incalculable.
There is no reporting yet whether this is due to the construction work, or whether it is related to the attacks on other churches in the area.
It remains to be seen what will happen in the aftermath. I expect donations from all around the world to rebuild it.
Politically and culturally I think it will be a seminal moment, particularly for those who want to preserve a Christian heritage in Europe, those who want to wipe out Christianity, and those who would rather raze the stone edifice of Notre Dame and replace it with a mosque.
-- Joe Biden