(Photo by Kay-Paris Fernandes/Getty Images)

Flames Rip Through Paris' Iconic Notre Dame Cathedral: Celebs React

PARIS, FRANCE - APRIL 15: A view of Notre-Dame Cathedral on fire as seen from Montmartre on April 15, 2019 in Paris, France. A fire broke out on Monday afternoon and quickly spread across the building, collapsing the spire. The cause is yet unknown but officials said it was possibly linked to ongoing renovation work. (Photo by Kay-Paris Fernandes/Getty Images)

Flames ripped through one of the world's most visited and treasured landmarks Monday as Paris' famed Notre Dame cathedral caught fire and burned for several hours.

The centuries-old cathedral caught fire Monday evening, local time, just days before Easter. Authorities were investigating the cause of the blaze, and believe it was due to a $6.8M renovation going on in the landmark.

The infrastructure of the cathedral had been in decline recently, having survived since the 13th century and standing through historic events including the French Revolution. As the fire raged on, hundreds of Parisians and tourists took to the streets, singing hymns and praying together.

By Monday afternoon, the spire of the cathedral and the roof had both collapsed as firefighters scrambled to figure out a solution to contain the fire. According to NBC News, authorities feared that the cathedral -- home to priceless works of art, stained glass windows and relics traced back to Jesus Christ -- would not be able to be saved.

Thankfully, no deaths or injuries were reported and authorities worked tirelessly to keep the crowds at bay from one of the city's top landmarks, which CNN reports attracts 13 million visitors annually.

Celebrities and social media users alike took to Twitter and Instagram Monday to express their sadness at watching the landmark's destruction in real time.

See some of the heartbreaking tributes below:

So very sad. So sorry, Paris. Bri

227k Likes, 3,415 Comments - Brian Harold May (@brianmayforreal) on Instagram: "So very sad. So sorry, Paris. Bri"

Idris Elba on Twitter

I cannot believe what's happening to Notre Dame.

I know this is an inspired representation of an even greater divinity. I know this blessed place is a human-made interpretation of what is mysterious, unknowable, and undefinable and while seeing her burn brings tears to my eyes, I know even flames cannot diminish her sacredness. Still, not her. Please. Not her. #notredame #ourlady

270.7k Likes, 1,452 Comments - Anne Hathaway (@annehathaway) on Instagram: "I know this is an inspired representation of an even greater divinity. I know this blessed place is..."

Maisie Williams on Twitter

Interrupting my birthday to express how much pain I'm in watching the Notre Dame fire unfold. Such an incredible building. I'm so sad

Some thing cannot be replaced. Notre Dame cathedral is one of them. This is gut wrenching. A work of art that has stood for almost 900 years. Who even possesses the ability to try to rebuild this kind of thing any more? A treasure up in flames. So sad

2,976 Likes, 132 Comments - Gary Holt (@garyholt_official) on Instagram: "Some thing cannot be replaced. Notre Dame cathedral is one of them. This is gut wrenching. A work..."

Red Sun Rising on Twitter

Not Notre Dame.... Why.... History lost ???? #France ♥️

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Ellie Goulding on Twitter

Feel profoundly sad about this... so much lost in a few seconds ... I am praying (which I don't do often) for the fire to be contained soon .... utterly heartbreaking https://t.co/VnRPHdHOFs

Lin-Manuel Miranda on Twitter

Standing here next to you, heartsick for Notre Dame...

camila on Twitter

my heart is breaking seeing the fire at notre dame. I'll never forget walking in the first time in Paris and being in awe of the beauty of it. ????

William Shatner on Twitter

Very sad to see the Cathedral of Notre Dame in flames. Such a magnificent and iconic structure. I hope everyone is safe and my heart goes out to the French people.

Luke Evans on Twitter

Im in utter shock watching the terrible sights on TV. #NotreDame cathedral is on fire and we are watching as the world is about to lose this 850 year old historical, iconic and beautiful world heritage building. Huge huge loss