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Firefighters douse flames rising from the roof at Notre-Dame Cathedral in Paris on April 15, 2019. A major fire broke out at the landmark Notre-Dame Cathedral in central Paris sending flames and huge clouds of grey smoke billowing into the sky, the fire service said. The flames and smoke plumed from the spire and roof of the gothic cathedral, visited by millions of people a year, where renovations are currently underway. (Photo by LUDOVIC MARIN / AFP) (Photo by LUDOVIC MARIN/AFP via Getty Images)

Firefighters douse flames rising from the roof at Notre-Dame Cathedral in Paris on April 15, 2019. A major fire broke out at the landmark Notre-Dame Cathedral in central Paris sending flames and huge clouds of grey smoke billowing into the sky, the fire service said. The flames and smoke plumed from the spire and roof of the gothic cathedral, visited by millions of people a year, where renovations are currently underway. (Photo by LUDOVIC MARIN / AFP) (Photo by LUDOVIC MARIN/AFP via Getty Images)
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AFP LUDOVIC MARIN

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Firefighters douse flames rising from the roof at Notre-Dame Cathedral in Paris on April 15, 2019. A major fire broke out at the landmark Notre-Dame Cathedral in central Paris sending flames and huge clouds of grey smoke billowing into the sky, the fire service said. The flames and smoke plumed from the spire and roof of the gothic cathedral, visited by millions of people a year, where renovations are currently underway. (Photo by Bertrand GUAY / AFP) (Photo by BERTRAND GUAY/AFP via Getty Images)

Firefighters douse flames rising from the roof at Notre-Dame Cathedral in Paris on April 15, 2019. A major fire broke out at the landmark Notre-Dame Cathedral in central Paris sending flames and huge clouds of grey smoke billowing into the sky, the fire service said. The flames and smoke plumed from the spire and roof of the gothic cathedral, visited by millions of people a year, where renovations are currently underway. (Photo by Bertrand GUAY / AFP) (Photo by BERTRAND GUAY/AFP via Getty Images)
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AFP BERTRAND GUAY

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TOPSHOT - 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. A major fire broke out at the landmark Notre-Dame Cathedral in central Paris sending flames and huge clouds of grey smoke billowing into the sky, the fire service said. The flames and smoke plumed from the spire and roof of the gothic cathedral, visited by millions of people a year, where renovations are currently underway. (Photo by FRANCOIS GUILLOT / AFP) (Photo by FRANCOIS GUILLOT/AFP via Getty Images)

TOPSHOT - 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. A major fire broke out at the landmark Notre-Dame Cathedral in central Paris sending flames and huge clouds of grey smoke billowing into the sky, the fire service said. The flames and smoke plumed from the spire and roof of the gothic cathedral, visited by millions of people a year, where renovations are currently underway. (Photo by FRANCOIS GUILLOT / AFP) (Photo by FRANCOIS GUILLOT/AFP via Getty Images)
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AFP FRANCOIS GUILLOT

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Firefighter douse flames billowing from the roof at Notre-Dame Cathedral in Paris on April 15, 2019. A major fire broke out at the landmark Notre-Dame Cathedral in central Paris sending flames and huge clouds of grey smoke billowing into the sky, the fire service said. The flames and smoke plumed from the spire and roof of the gothic cathedral, visited by millions of people a year, where renovations are currently underway. (Photo by FRANCOIS GUILLOT / AFP) (Photo by FRANCOIS GUILLOT/AFP via Getty Images)

Firefighter douse flames billowing from the roof at Notre-Dame Cathedral in Paris on April 15, 2019. A major fire broke out at the landmark Notre-Dame Cathedral in central Paris sending flames and huge clouds of grey smoke billowing into the sky, the fire service said. The flames and smoke plumed from the spire and roof of the gothic cathedral, visited by millions of people a year, where renovations are currently underway. (Photo by FRANCOIS GUILLOT / AFP) (Photo by FRANCOIS GUILLOT/AFP via Getty Images)
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AFP FRANCOIS GUILLOT

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TOPSHOT - Plumes of 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. A major fire broke out at the landmark Notre-Dame Cathedral in central Paris sending flames and huge clouds of grey smoke billowing into the sky, the fire service said. The flames and smoke plumed from the spire and roof of the gothic cathedral, visited by millions of people a year, where renovations are currently underway. (Photo by FRANCOIS GUILLOT / AFP) (Photo by FRANCOIS GUILLOT/AFP via Getty Images)

TOPSHOT - Plumes of 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. A major fire broke out at the landmark Notre-Dame Cathedral in central Paris sending flames and huge clouds of grey smoke billowing into the sky, the fire service said. The flames and smoke plumed from the spire and roof of the gothic cathedral, visited by millions of people a year, where renovations are currently underway. (Photo by FRANCOIS GUILLOT / AFP) (Photo by FRANCOIS GUILLOT/AFP via Getty Images)
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AFP FRANCOIS GUILLOT