A fire engulfed the iconic Notre Dame cathedral in Paris Monday, bringing down the main spire as firefighters worked feverishly to salvage the 12th-century structure.

Shepard Smith presented breaking news coverage on Fox News Channel, as the inferno spread throughout the bell towers.

"Everything is burning, nothing will remain from the frame," said Notre Dame spokesman Andre Finot, calling the damage "colossal."

French President Emmanuel Macron arrived on the scene to meet with police and emergency responders, who were working to salvage artwork and artifacts inside.

Horrified onlookers gathered below near the Seine River to capture video and photos of the fire.

Firefighters were working from the inside and outside with hoses against the massive blaze. The cathedral was undergoing a $6.8 million restoration project.

Sources told Fox News that it appears the fire was related to the construction.

President Donald Trump wrote on Twitter it was “horrible to watch the massive fire at Notre Dame Cathedral in Paris.”

Local officials said the fire could not be battled with helicopters because dropping water from the air could have caused the entire structure to collapse, endangering surrounding buildings. 

Located on the Ile de la Cite in the center of Paris, the Gothic cathedral attracts millions of tourists each year. 

See complete coverage on FoxNews.com.