Smoke and flames rise during a fire at the landmark...

Smoke and flames rise during a fire at the landmark Notre Dame Cathedral in central Paris on Monday, potentially involving renovation work being carried out at the site, the fire service said. Credit: AFP / Getty Images / Francois Guillot

PARIS — A catastrophic fire engulfed the upper reaches of Paris’ soaring Notre Dame Cathedral on Monday as it was undergoing renovations, threatening one of the great architectural treasures of the Western world as tourists and Parisians looked on aghast from the streets below.

The blaze collapsed the cathedral’s spire and spread to one of its landmark rectangular towers, but Paris fire chief Jean-Claude Gallet said the church’s structure had been saved after firefighters managed to stop the fire from spreading to the northern belfry. The 12th century cathedral, home to incalculable works of art, is one of the world’s most famous tourist attractions, immortalized in Victor Hugo’s 1831 novel, “The Hunchback of Notre-Dame.”

The exact cause of the blaze was not known, but French media quoted the Paris fire brigade as saying it was “potentially linked” to a $6.8 million renovation project on the church’s spire and its 250 tons of lead. The Paris prosecutor’s office ruled out arson and possible terror-related motives, saying it was treating it as an accident.

Flames shot out of the roof behind the nave of the cathedral, among the most visited landmarks in the world. Hundreds of people lined up on bridges around the island that houses the church, watching in shock as acrid smoke rose in plumes. Speaking alongside junior Interior Minister Laurent Nunez late Monday, police chief Jean-Claude Gallet said “two thirds of the roofing has been ravaged.” Gallet said firefighters would keep working overnight to cool down the building.

Late Monday, signs pointed to the fire nearing an end as lights could be seen through the windows moving around the front of the cathedral, apparently investigators inspecting the scene.

The fire came less than a week before Easter, amid Holy Week commemorations. As the cathedral burned, Parisians gathered to pray and sing hymns outside the church of Saint Julien Les Pauvres, across the river from Notre Dame, while the flames lit the sky behind them.

President Emmanuel Macron was treating the fire as a national emergency, rushing to the scene and straight into meetings at the Paris police headquarters nearby. Paris Archbishop Michel Aupetit invited priests across France to ring church bells in a call for prayers for the beloved Paris cathedral.

Deputy Mayor Emmanuel Grégoire said emergency services were trying to salvage the famed art pieces stored in the cathedral.

Built in the 12th and 13th centuries, Notre Dame is the most famous of the Gothic cathedrals of the Middle Ages, as well as one of the most beloved structures in the world. Situated on the Île de la Cité, an island in the Seine river, it is famous for, among other things, its many gargoyles and its iconic flying buttresses.

Among the most celebrated artworks inside are three stained-glass rose windows, placed high up on the west, north and south faces of the cathedral. Its priceless treasures include a Catholic relic, the crown of thorns, which is displayed only occasionally, including on Fridays during Lent.

Historian Camille Pascal told BFM broadcast channel the blaze marked “the destruction of invaluable heritage.”

Flames rise during a fire at the landmark Notre Dame...

Flames rise during a fire at the landmark Notre Dame Cathedral in central Paris on Monday, potentially involving renovation work being carried out at the site, the fire service said. Credit: AFP / Getty Images / Francois Guillot

“It’s been 800 years that the cathedral watches over Paris," Pascal said. “Happy and unfortunate events for centuries have been marked by the bells of Notre Dame.”

He added: “We can be only horrified by what we see.”

Long Island Catholic leaders spoke of pain and kinship as they prayed for the iconic cathedral, the emergency responders and the archbishop of Paris during Holy Week,  which is a story of Jesus' death, followed by his resurrection on Easter Sunday.

"We join in sorrow and prayer Archbishop Michel Aupetit and our Catholic brothers and sisters in Paris as we watch fire consume the great Notre-Dame Cathedral," Bishop John Oliver Barres, head of the Diocese of Rockville Centre, said in a statement. "While the Cathedral of Notre Dame is one of the great and most beautiful Cathedrals of the world steeped in history, our Catholic faith has and will continue to endure even the destruction of the physical structures where the faithful come to worship."

Associated Press reporters saw massive plumes of yellow-brown smoke filling the air above the Cathedral and ash falling on the island that houses Notre Dame in the center of Paris. As the spire fell, the sky lit up orange.

Seen from across the Seine River, smoke and flames rise...

Seen from across the Seine River, smoke and flames rise during a fire at the landmark Notre Dame Cathedral in central Paris on Monday. Credit: AFP / Getty Images / Francois Guillot

Mayor Anne Hidalgo said in a Twitter message that firefighters were still trying to limit the fire and urged Paris citizens to respect the security perimeter set up around the cathedral.

She said city authorities were in touch with the Paris diocese.

Reactions came swiftly from around the world. The Vatican issued a statement expressing shock and sadness for the “terrible fire that has devastated the Cathedral of Notre Dame, symbol of Christianity in France and in the world.”

In Washington, President Donald Trump tweeted: “So horrible to watch the massive fire at Notre Dame Cathedral in Paris” and suggested first responders use “flying water tankers” to put it out.

Cardinal Timothy Dolan, the archbishop of New York, said he was praying “to ask the intercession of Notre Dame, our Lady, for the Cathedral at the heart of Paris, and of civilization, now in flames! God preserve this splendid house of prayer, and protect those battling the blaze.”

With Ellen Yan and Bart Jones

Facts and figures

NAME: Notre Dame de Paris, which means Our Lady of Paris.

CONSTRUCTION: The building stands on the Île de la Cité, a small island in Paris’ Seine River. Construction was begun in 1163, and its two massive towers were finished around 1245, but the building was not completed until the beginning of the 14th century. Its central spire was added in the 19th century.

MEASUREMENTS AND DESIGN: The interior of the cathedral is 427 feet by 157 feet. The main structure is 211 feet high. The three famed rose windows date to the 13th century.

FRENCH REVOLUTION: In the wake of the French Revolution, the cathedral was declared a “Temple of Reason” as part of an anticlerical movement. All of the original bells were destroyed, except for one, called Emmanuel and weighing 13 tons.

RESTORATION: In 2013, the cathedral celebrated its 850 years with a refurbished organ. Each of the nearly 8,000 pipes, some of which date back to the 18th century, was individually cleaned and returned to its place. Meanwhile, nine new, gargantuan bells replaced the 19th century ones.

VISITORS: An average of 30,000 people a day visit the cathedral.

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