Inspectors are seen on the roof of the landmark Notre Dame Cathedral in central Paris on April 16, 2019, the day after a fire ripped through its main roof.
Paris public prosecutor Remy Heitz said the cathedral's fire alarms went off twice on Monday evening, beginning at 6:20pm (local time).
"This is terrible for them", said Mulaire.
He said the restoration work will have to use new technologies to rebuild the roof.
Hours after President Macron - whose government had previously refused to spend more than a few million euros repairing the 855-year-old cathedral - launched an appeal for funds while it was still ablaze, nearly €700 million had been raised.
Macron said in a televised address on Tuesday night that the cathedral would be rebuilt "even more beautifully" within the next few years as he urged the French nation to "come together".
"All the 18th-century steles, the pietas, frescoes, chapels and the big organ are fine", he said.
Notre Dame's famed stained-glass rose windows and most of its many religious relics appeared to have escaped the worst as well, easing fears for the fate of the vast trove of artworks in the gothic cathedral.
However, there are concerns that even the $1 billion pledged so far may not be able to replace what was lost in the blaze - it also depends on the availability of materials.
A statement from Francois-Henri Pinault said: "This tragedy impacts all French people" and "everyone wants to restore life as quickly as possible to this jewel of our heritage".
Likewise, the centuries-old timber within the building's internal structure, much of which was crafted into an intricate support structure by medieval artisans, may be irreplaceable.
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"Those trees had been saplings in the 10th century, they were mature trees by the 12th century when they were felled". On Monday night when the flames made the nave impenetrable, Colossus made its entrance, controlled from a distance by firefighters. "Or in fact is that the great compromise you'd make?"
"Our history never stops and that we will always have trials to overcome", he said. "But perhaps it can't be recreated as it was". He announced a worldwide fundraising campaign that will raise money for the cathedral's restoration.
Debris inside Notre Dame cathedral in Paris.
"It's a very deep sadness".
The tunic allegedly worn by Saint Louis IX as he brought the crown of thorns to Paris was kept inside the cathedral.
As monetary pledges rack up to contribute to France's plan to rebuild the iconic cathedral, the Quebec government said on Tuesday it is also ready to lend a helping hand.
Its a fundamental step, and very complex, because its hard to send workers into a monument whose vaulted ceilings are swollen with water, he said on France-Info.
He also believes that Notre Dame will be restored, though that did not happen with St. Boniface Cathedral.
One of the group's members, Ron Ivey, said he was "heartbroken".
Following news of the fire, many Japanese people expressed their sadness online with posts ranging from "I'm terribly sad because I've always wanted to visit the cathedral" to "I'm in shock and distressed".
Will Quebec help rebuild the cathedral?
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