Flames and smoke rise from Notre Dame cathedral as it burns in Paris, Monday, April 15, 2019. Massive plumes of yellow brown smoke is filling the air above Notre Dame Cathedral and ash is falling on tourists and others around the island that marks the center of Paris. (Photo by Thibault Camus/AP Photo)





Smoke and flames rise during a fire at the landmark Notre-Dame Cathedral in central Paris on April 15, 2019, potentially involving renovation works being carried out at the site, the fire service said. (Photo by Pierre Galey/AFP Photo)





Smoke billows from the Notre Dame Cathedral after a fire broke out, in Paris, France, April 15, 2019. (Photo by Julie Carriat/Reuters)





People watch the landmark Notre-Dame Cathedral burning in central Paris on April 15, 2019. (Photo by Nicolas Liponne/NurPhoto via Getty Images)





Smoke billows near scaffolding as fire engulfs the spire of Notre Dame Cathedral in Paris, France April 15, 2019. (Photo by Benoit Tessier/Reuters)





Smoke and flames rise during a fire at the landmark Notre-Dame Cathedral in central Paris on April 15, 2019, potentially involving renovation works being carried out at the site, the fire service said. (Photo by Hubert Hitier/AFP Photo)





Notre Dame cathedral is burning in Paris, Monday, April 15, 2019. Massive plumes of yellow brown smoke is filling the air above Notre Dame Cathedral and ash is falling on tourists and others around the island that marks the center of Paris. (Photo by Lori Hinant/AP Photo)





People watch Notre Dame cathedral burning in Paris, Monday, April 15, 2019. Massive plumes of yellow brown smoke is filling the air above Notre Dame Cathedral and ash is falling on tourists and others around the island that marks the center of Paris. (Photo by Rafael Yaghobzadeh/AP Photo)





French President Emmanuel Macron, center, and his wife Brigitte walk away from Notre Dame cathedral in Paris, Monday, April 15, 2019. A catastrophic fire engulfed the upper reaches of Paris' soaring Notre Dame Cathedral as it was undergoing renovations Monday, threatening one of the greatest architectural treasures of the Western world as tourists and Parisians looked on aghast from the streets below. (Photo by Philippe Wojazer/Pool via AP Photo)





Plumes of smoke rises from Notre Dame cathedral burning in Paris, Monday, April 15, 2019. Massive plumes of smoke fills the air above Notre Dame Cathedral and ash is reported to be falling on tourists and others around the island that marks the center of Paris. (Photo by AP Photo)





People watch as flames and smoke rise from Notre Dame cathedral as it burns in Paris, Monday, April 15, 2019. Massive plumes of yellow brown smoke is filling the air above Notre Dame Cathedral and ash is falling on tourists and others around the island that marks the center of Paris. (Photo by Thibault Camus/AP Photo)





People kneel on the pavement as they pray outside watching flames engulf Notre-Dame Cathedral in Paris on April 15, 2019. (Photo by Eric Feferberg/AFP Photo)





People watch from a bridge as smoke billows from Notre Dame Cathedral during a fire in Paris, France April 15, 2019. (Photo by Benoit Tessier/Reuters)





The steeple of the landmark Notre-Dame Cathedral collapses as the cathedral is engulfed in flames in central Paris on April 15, 2019. (Photo by Geoffroy Van Der Hasselt/AFP Photo)





This general view taken from Montparnasse Tower shows flames and smoke as they billow from the roof at Notre-Dame Cathedral in Paris on April 15, 2019. A fire broke out at the landmark Notre-Dame Cathedral in central Paris, potentially involving renovation works being carried out at the site, the fire service said.Images posted on social media showed flames and huge clouds of smoke billowing above the roof of the gothic cathedral, the most visited historic monument in Europe. (Photo by Philippe Lopez/AFP Photo)





The steeple collapses as smoke and flames engulf the Notre-Dame Cathedral in Paris on April 15, 2019. (Photo by Geoffroy Van Der Hasselt/AFP Photo)





A woman prays next to Notre-Dame Cathedral in Paris on April 15, 2019. (Photo by Benoit Tessier/Reuters)





Sparks fill the air as Paris Fire brigade members spray water to extinguish flames as the Notre Dame Cathedral burns in Paris, France, April 15, 2019. (Photo by Philippe Wojazer/Reuters)





People watch as flames and smoke rise from Notre Dame cathedral as it burns in Paris, Monday, April 15, 2019. Massive plumes of yellow brown smoke is filling the air above Notre Dame Cathedral and ash is falling on tourists and others around the island that marks the center of Paris. (Photo by Thibault Camus/AP Photo)





Flames rise from Notre Dame cathedral as it burns in Paris, Monday, April 15, 2019. Massive plumes of yellow brown smoke is filling the air above Notre Dame Cathedral and ash is falling on tourists and others around the island that marks the center of Paris. (Photo by Thibault Camus/AP Photo)