I believe that they think that this was an accident stemming from an accident during renovations, but it’s still ongoing. I wouldn’t care to speculate on any other causes until there’s more information; it is, after all, a very old building and entropy gets everything in the end. The damage sounds very bad:
The roof of Paris’ famed Notre Dame Cathedral collapsed Monday as a massive fire ripped through the structure.
The city’s mayor and firefighters warned people to stay away from the area. There have been no confirmed deaths, according to Paris police, while a French government official said no injuries had yet been reported.
A sad day for all of us. I hope that there will be no deaths or injuries, of course. And that as few as possible of the treasures inside were damaged.