A report by BBC says the fire began at around 18:30 (16:30 GMT) and quickly reached the roof of the cathedral, destroying its stained-glass windows and the wooden interior before toppling the spire.
French officials say the 850-year-old Gothic building’s spire and roof have collapsed but the main structure, including the two bell towers, has been saved.
The report monitored by Naija News, says firefighters are still working to contain the blaze as teams try to salvage the artwork stored inside.
Though the cause of the fire outbreak has not been ascertained, French officials, however, say it could be linked to the renovation work that began after cracks appeared in the stone, sparking fears the structure could become unstable.
Reacting in a tweet, Trump wrote: “So horrible to watch the massive fire at Notre Dame Cathedral in Paris. Perhaps flying water tankers could be used to put it out. Must act quickly!”