How the Notre-Dame fire spread and the damage it caused, shown in graphics and images.
The cathedral has come to symbolise the heart of France since it was built 850 years ago.
Bertrand de Feydeau, vice-president of preservation group Fondation du Patrimoine, told France Info radio that the wooden roof that went up in flames was built with beams more than 800 years ago from primal forests.
He says the cathedral’s roof cannot be rebuilt exactly as it was before the fire because “we don’t, at the moment, have trees on our territory of the size that were cut in the 13th century.”
Using modern technology to preserve a medieval building is nothing new in France.
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Four right-wing, nationalist parties declare an alliance ahead of European Parliament elections.
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