President Donald Trump reacted to a serious fire at Notre Dame Cathedral in Paris, France on Monday.

“So horrible to watch the massive fire at Notre Dame Cathedral in Paris,” Trump wrote on Twitter.

Live news cameras showed the roof and the steeple of the famous cathedral engulfed in flames.

The president also commented on the news at an event in Minnesota promoting the success of the tax cuts boosting the economy.

“It’s one of the great treasures of the world, the greatest artists in the world … might be greater than any museum in the world, and it’s burning very badly, looks like it’s burning to the ground,” he said, noting that he watched the footage of the fire on Air Force One.

Trump acknowledged the devastating news put a “damper” on the event on tax reform.

“That’s beyond countries, that’s beyond anything, that’s a part of our growing up, it’s a part of our culture, it’s a part of our lives, it’s a truly great cathedral,” Trump said.

He recalled personally visiting the cathedral in France.

“There’s no cathedral in the world like it,” Trump said.

He said that the early estimations were that the cathedral fired started during a renovation process.

“At this moment they don’t know, but they think it was caused by renovation, and I hope that’s the reason, renovation, you know, what’s that all about?” he said. “But it’s a terrible sight to behold.”

It is unclear what started the fire, but the world watched helplessly as there were no signs of water being sprayed on the roof as the spire collapsed.

“Perhaps flying water tankers could be used to put it out,” Trump wrote. “Must act quickly!”

First Lady Melania Trump also reacted to the news on Twitter.

“My heart breaks for the people of Paris after seeing the fire at Notre Dame Cathedral,” she wrote. “Praying for everyone’s safety.”

My heart breaks for the people of Paris after seeing the fire at Notre Dame Cathedral. Praying for everyone’s safety. — Melania Trump (@FLOTUS) April 15, 2019