The world watched in shock as parts of the historic Notre-Dame Cathedral went up in flames.
Local Paris merchants whose livelihoods depend on Notre Dame tourism are now anxious about their own futures after the devastation.
French President Emmanuel Macron ratcheted up the pressure by setting a five-year deadline to restore the 12th-century landmark.
France will open the redesign of the Notre Dame cathedral's iconic roofline to global architects after Monday night's blaze gutted the oak-framed structure and sent its 300-foot spire crashing through its vaulted ceiling, the Prime Minister said on Wednesday. About two-thirds of its roof was damaged, and its spire has collapsed.
"The end of the fire doesn't mean the edifice is totally saved".
The Archbishop of Paris Michel Aupetit told RMC radio, "Notre-Dame was destroyed but the soul of France was not".
US President Donald Trump relayed Americans' "condolences" to Macron over the fire, the White House said.
The cathedral's famous 18th-century organ which boasts more than 8000 pipes also survived.
Monsignor Patrick Chauvet, the Notre-Dame rector, told French radio that the cathedral's "fire watchers" were on constant lookout and three times each day, made "assessments" in the vulnerable area under the wooden roof.
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The Paris fire service said that the last remnants of the blaze were extinguished Tuesday, 15 hours after the fire broke out. While it can never replace trusty firefighters, it can help keep them safe and, as demonstrated in the fire at Notre Dame, can play a vital role in fighting risky and devastating fires.
He said firefighters and experts are still closely monitoring the building to determine how much damage the structure suffered and what needs to be dismantled to avoid collapse.
Smoke billows near scaffolding as fire engulfs the spire of Notre Dame Cathedral in Paris, France.
The city's public prosecutor, Remy Heitz, said on Tuesday there was no sign of arson and it was likely to have been the result of an accident.
More than 800 million euros ($904 million) have been donated to the restoration efforts already, including some in the tens of millions of euros from some of France's wealthiest families.
In subsequent tweets, Windsor said she didn't know for sure if they were father and child, explaining that it was "simply the dynamic I observed from them while debating on interrupting this moment".
Hidalgo also said on Twitter that the tunic of St. Louis, a long shirtlike garment from the 13th century and believed to have belonged to King Louis IX, was also rescued. "It will take some more time to evaluate what we need to do to adjust here in Paris in order to celebrate elsewhere".
However, investigators will be interviewing people who worked on the cathedral's roof, where the flames first started.
Notre-Dame de Paris was built over a period of almost 200 years, starting in the middle of the 12th century, though it was only in the mid-1800s that architect Eugene Viollet-le-Duc added the lead-covered spire during restoration work.