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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 credit should read LUDOVIC MARIN/AFP/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 credit should read LUDOVIC MARIN/AFP/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 credit should read BERTRAND GUAY/AFP/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 credit should read BERTRAND GUAY/AFP/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 credit should read FRANCOIS GUILLOT/AFP/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 credit should read FRANCOIS GUILLOT/AFP/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 credit should read FRANCOIS GUILLOT/AFP/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 credit should read FRANCOIS GUILLOT/AFP/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 credit should read FRANCOIS GUILLOT/AFP/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 credit should read FRANCOIS GUILLOT/AFP/Getty Images)
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AFP FRANCOIS GUILLOT