Notre Dame Cathedral in Paris. Major fire, not yet under control.
Severe damage to the top of the building, but – at least as of now – they think they will save the main structure.
No indication – so far – that this was terrorist or yellow-jacket (sometimes hard to differentiate) involved.
More as it becomes available.
UPDATE: A reports is now circulating that, according to the police, there were no construction workers on site when the fire broke out. If true, the specter of a terrorist attack increases.
This is not to say such an attack took place, only that the possibility appears more likely.
Let’s wait before making any judgements.