First images have started to emerge of the damage inside the Notre Dame Cathedral in the heart of Paris after Monday's devastating fire.

Authorities said early Tuesday that the fire was now controlled and the iconic bell towers at the front appeared to be safe.

The inferno destroyed the roof of the 850-year-old UNESCO world heritage landmark, whose spectacular Gothic spire collapsed as orange flames and clouds of grey smoke billowed into the sky.

However the rest of the structure appeared complete, including many of the well-known vaults soaring to the ceiling.

Junior interior minister Laurent Nunez said "some weaknesses" had been identified particularly in the vault and the gable of the northern transept, which have to be secured.

The Holy Crown of Thorns and a sacred tunic worn by 13th-century French king Louis, two irreplaceable artefacts, had been rescued, the cathedral rector Patrick Chauvet said.  

The big cross at the main altar survived.

The recently restored 8,000 pipe, five-keyboard organ, is believed to have survived, as have at least two of the three famous Rose Windows – huge round stained-glass windows over the cathedral's three main portals that date back to the 13th century.

French President Emmanuel Macron vowed to rebuild the cathedral in Paris.

Macron expressed relief that "the worst had been avoided" as the blaze had at one point threatened the entire edifice.

Around 400 firefighters battled into the night to control the flames, declaring in the early hours of Tuesday that the fire was under control, around nine hours after it broke out.

Paris fire brigade chief Jean-Claude Gallet said "we can consider that the main structure of Notre-Dame has been saved and preserved" as well as the two towers.

- 'France is Notre Dame' -

"Notre-Dame survived all the wars, all the bombardments. We never thought it could burn. I feel incredibly sad and empty," Stephane Seigneurie, a consultant who joined other shocked onlookers in a solemn rendition of "Ave Maria" as they watched the fire from a nearby bridge.

Gasps and cries of "Oh my god" erupted around an hour after the fire first broke out when the top portion of the church's spire came crashing down.

"We have been dealt a knockout blow," a stricken-looking Paris Archbishop Michel Aupetit told reporters.

The cause of the blaze was not immediately clear, but the cathedral had been undergoing intense restoration work which the fire service said could be linked to the blaze. 

French prosecutors said it was being currently being treated as accident.

Historians expressed incredulity at the collapse of a building that has been a symbol of France for almost a millennium.

"If Paris is the Eiffel Tower then France is Notre Dame. It's the entire culture, entire history of France incarnated in this monument," Bernard Lecomte, a writer and specialist in religious history told BFM TV.

Deputy Paris mayor Emmanuel Gregoire told the channel that workers were scrambling "to save all the artworks that can be saved." Officials later said teams had managed to salvage an unknown quantity of the cultural treasures.

The structure of Notre Dame, without the spire, early on Tuesday.The structure of Notre Dame, without the spire, early on Tuesday.

- 'Water bombers not used' -
One firefighter was seriously injured in the blaze, the fire brigade said.

US President Donald Trump in a tweet said it was "horrible" to watch the fire but caused controversy by offering advice on how to put it out.

"Perhaps flying water tankers could be used to put it out. Must act quickly!" he said.

But France's civil security service, which oversees crisis management in the country, tweeted back at Trump that the use of water-bombing aircraft was not being considered.

"If used, (this) could lead to the collapse of the entire structure of the cathedral," it said.

- 'Will never be the same' -
The cathedral was located at the centre of the French capital in the Middle Ages and its construction was completed in 1345 after some 200 years of work.

During the French Revolution in the 18th century, the cathedral was vandalised in widespread anti-Catholic violence: its spire was dismantled, its treasures plundered and its large statues at the grand entrance doors destroyed.

It would go on to feature as a central character in a Victor Hugo novel published in 1831, "The Hunchback of Notre-Dame" and shortly afterwards a restoration project lasting two decades got under way, led by architect Eugene Viollet-le-Duc.

The building survived the devastation of two global conflicts in the 20th century and famously rang its bells on August 24, 1944, the day of the Liberation of Paris from German occupation at the end of the World War II.

"Paris is disfigured. The city will never be like it was before," said Philippe, a communications worker in his mid-30s.

Jacky Lafortune, a 72-year-old artist and self-described atheist stood forlornly on the banks of the River Seine staring at the cathedral.

Comparing the mood in the French capital to the aftermath of a terror attack he said: "But this stirs much deeper emotions because Notre-Dame is linked to the very foundations of our culture." 

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