This photo dated Tuesday April 16, 2019, issued Wednesday April 17, 2019 by the Paris City Hall, shows artefacts rescued from the Notre Dame blaze in Paris. French President Emmanuel Macron ratcheted up the pressure by setting a five-year deadline to restore the 12th-century landmark. Macron is holding a special Cabinet meeting Wednesday dedicated to the Notre Dame disaster, which investigators believe was an accident possibly linked to renovation work. (Henri Garat/Ville de Paris via AP)

This photo dated Tuesday April 16, 2019, issued Wednesday April 17, 2019, by the Paris City Hall, shows artefacts rescued from the Notre Dame blaze in Paris. French President Emmanuel Macron ratcheted up the pressure by setting a five-year deadline to restore the 12th-century landmark. Macron is holding a special Cabinet meeting Wednesday dedicated to the Notre Dame disaster, which investigators believe was an accident possibly linked to renovation work. (Henri Garat/Ville de Paris via AP)

This photo dated Tuesday April 16, 2019, issued Wednesday April 17, 2019 by the Paris City Hall, shows artefacts rescued from the Notre Dame blaze in Paris. French President Emmanuel Macron ratcheted up the pressure by setting a five-year deadline to restore the 12th-century landmark. Macron is holding a special Cabinet meeting Wednesday dedicated to the Notre Dame disaster, which investigators believe was an accident possibly linked to renovation work. (Henri Garat/Ville de Paris via AP)

This photo dated Tuesday April 16, 2019, issued Wednesday April 17, 2019 by the Paris City Hall, shows artefacts rescued from the Notre Dame blaze in Paris. French President Emmanuel Macron ratcheted up the pressure by setting a five-year deadline to restore the 12th-century landmark. Macron is holding a special Cabinet meeting Wednesday dedicated to the Notre Dame disaster, which investigators believe was an accident possibly linked to renovation work.(Henri Garat/Ville de Paris via AP)

This photo dated Tuesday April 16, 2019, issued Wednesday April 17, 2019 by the Paris City Hall, shows artefacts rescued from the Notre Dame blaze in Paris. French President Emmanuel Macron ratcheted up the pressure by setting a five-year deadline to restore the 12th-century landmark. Macron is holding a special Cabinet meeting Wednesday dedicated to the Notre Dame disaster, which investigators believe was an accident possibly linked to renovation work.(Henri Garat/Ville de Paris via AP)

This photo dated Tuesday April 16, 2019, issued Wednesday April 17, 2019 by the Paris City Hall, shows artefacts rescued from the Notre Dame blaze in Paris. French President Emmanuel Macron ratcheted up the pressure by setting a five-year deadline to restore the 12th-century landmark. Macron is holding a special Cabinet meeting Wednesday dedicated to the Notre Dame disaster, which investigators believe was an accident possibly linked to renovation work. (Henri Garat/Ville de Paris via AP)