Smoke billows as fire engulfs the spire of Notre Dame Cathedral in Paris, France April 15, 2019. Notre-Dame Cathedral went up in flames on Monday in a roaring blaze that devastated the Parisian landmark, a searing loss for the city and for France. REUTERS/Benoit Tessier

Smoke billows as fire engulfs the spire of Notre Dame Cathedral in Paris, France April 15, 2019. Notre-Dame Cathedral went up in flames on Monday in a roaring blaze that devastated the Parisian landmark, a searing loss for the city and for France. REUTERS/Benoit Tessier

Smoke billows as fire engulfs the spire of Notre Dame Cathedral in Paris, France April 15, 2019. Notre-Dame Cathedral went up in flames on Monday in a roaring blaze that devastated the Parisian landmark, a searing loss for the city and for France. REUTERS/Benoit Tessier

Smoke billows as fire engulfs the spire of Notre Dame Cathedral in Paris, France April 15, 2019. Notre-Dame Cathedral went up in flames on Monday in a roaring blaze that devastated the Parisian landmark, a searing loss for the city and for France. REUTERS/Benoit Tessier

Smoke billows as fire engulfs the spire of Notre Dame Cathedral in Paris, France April 15, 2019. Notre-Dame Cathedral went up in flames on Monday in a roaring blaze that devastated the Parisian landmark, a searing loss for the city and for France. REUTERS/Benoit Tessier

Smoke billows from the Notre Dame Cathedral after a fire broke out, in Paris, France, April 15, 2019. Notre-Dame Cathedral went up in flames on Monday in a roaring blaze that devastated the Parisian landmark, a searing loss for the city and for France. REUTERS/Julie Carriat