A fire has broken out at the Gothic gem of Nantes cathedral in France, CNN reported.

"I can confirm that we are not in the Notre Dame of Paris situation, rooftop is not affected," Fire Chief Laurent Ferlay told CNN affiliate BFM on Saturday. 

"The damage is concentrated on the organ, which seems to be completely destroyed. Its platform is very unstable and could collapse," he said.

"After Notre-Dame, the Saint-Pierre-et-Saint-Paul cathedral, in the heart of Nantes, is in flames. Support to our firefighters who take all risks to save this Gothic gem of the city of the Dukes," French President Emmanuel Macron tweeted.