Firefighters are tackling a blaze that broke out at Notre-Dame Cathedral in Paris on April 15. While the fire's cause is still under investigation, the Paris fire brigade said it could be traced to renovations that were under way, the Associated Press reported.

Images show flames engulfing the church's spire, which collapsed—its peak has been the site of a $6.8 million renovation. According to reports, the church's wooden interior is now also ablaze.

Paris Mayor Anne Hidalgo called it a "terrible fire" and encouraged those in the area to be mindful of the boundaries that fire crews set up to ensure their safety, BBC reported.

Construction first began on the iconic church in 1163, and last year, the Catholic Church in France began an appeal to raise funds to save the crumbling structure.

No deaths have been reported.

Notre-Dame Cathedral's trademark spire has collapsed during a major fire that broke out at central Paris on Monday afternoon. pic.twitter.com/YPBkD5ikv4

— China Daily (@ChinaDaily) April 15, 2019

I’ve No words about Notre Dame tragedy..😶#paris #notredamedeparis pic.twitter.com/69yHPRqU9c

— elene nizharadze (@elene82608500) April 15, 2019

Notre-Dame de Paris wasted.
(photo isn't mine) pic.twitter.com/gpz2ZCbWJv

— ненависть воплощённая (@arginorankent) April 15, 2019

#BREAKING: The games Notre Dame Cathedral in Paris, France is on fire and burning... #NotreDameCathedral pic.twitter.com/akQipwSe2F

— Bryan Schuerman, M.Ed. (@BSchuermanWX) April 15, 2019

WATCH: Crowds surround Notre-Dame Cathedral as spire collapses pic.twitter.com/n2473XfO44

— Reuters Top News (@Reuters) April 15, 2019

Horrible.. #NOTRE_DAME pic.twitter.com/TPpdlVD5y9

— 𝕋𝕙𝕠𝕞|Stream Bwl (@joonkiiiiiii) April 15, 2019

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