Two Fox News anchors cut off guests who tried to talk about suspicions on the origins of the Notre Dame fire on Monday.

Media critic and deputy mayor of Neuilly-sur-Seine Philippe Karsenty's line was cut after he insinuated the fire was a terrorist attack, while Catholic League president Bill Donohue was shut down after he said he was suspicious the fire was related to other church burnings.

“It’s like a 9/11, a French 9/11,” Karsenty said during an appearance with Fox News’ Shepard Smith. “It’s a big shock. This church was there for more than 850 years. You need to know that for the past years, we’ve had churches desecrated each and every week all over France. Of course, you will hear the story of the politically — the political correctness, which will tell you it’s probably an accident.”

Although Smith said he would “love to hear” definitive information on the origins of the fire, Karsenty stuck to conjecture.

“No, sir, we’re not doing that here, not now, not on my watch,” Smith said. “The man on the phone with us has absolutely no information of any kind about the origin of this fire and neither do I.”

“The fire investigators will at some point come to a determination about what caused this and conspiracy theories about anything are worthless and in many cases counterproductive and injurious to society,” Smith said. “And those who entertain them are not acting in the best interests of the people of this planet.”

[Opinion: The fall of Notre Dame isn't just a tragedy for Catholics]

Karsenty was previously convicted of defamation after he blamed France 2, a French television network, for orchestrating the death of a Palestinian child.

In the next hour, Donahue’s interview with Fox News’ Neil Cavuto was cut short after he openly speculated how the fire originated, citing other churches and tabernacles that have been targeted and destroyed recently.

“Well, Neil, if it is an accident, it’s a monumental tragedy,” Donohue said during an interview with Cavuto. “But forgive me for being suspicious.”

“Just last month, a 17th century church was set on fire in Paris,” he said. “We have seen tabernacles knocked down, crosses have been torn down, statues have been smashed.”

Even after Cavuto reminded Donahue to refrain from sharing any inklings on the fire, Donahue didn’t stop sharing his opinions. “I’m sorry, when I find out that the Eucharist is being destroyed and excrement is being smeared on crosses, this is what’s going on now,” Donahue said.

[Read more: Trump says Notre Dame Cathedral fire a 'terrible sight to behold']

“No, sir, we’re not doing that here ... not on my watch. The man ... has absolutely no information of any kind about the origin ... and neither do I.”



Fox News hosts refuse to let guests make wild claims about the cause of the #NotreDameCathedral fire.https://t.co/FkE0GUWbGm pic.twitter.com/zfalGTjyAr — Washington Examiner (@dcexaminer) April 16, 2019

Cavuto then ended the call citing “conjectures” on the fire were not welcome.

“I do want to let people know, and again we’re not trying to be rude to our guests here, there is so much we do not know about what happened here,” Cavuto said. “We do know four hours ago, something started here. There are incidents that have been raised against the Catholic Church on popular tourist sites in and around Paris, no stranger to attacks, but another leap to take views like that when we don’t know."

Officials are still unsure what prompted the fire at approximately 7 p.m. on Monday, although authorities say a preliminary investigation suggests it was accidental. The cathedral’s 300-foot spire crumbled in the fire, but officials say the cathedral's iconic twin bell towers will survive.

Construction of the cathedral began in 1163 and wrapped up in 1345. The cathedral endured some destruction from the French Revolution during the 1790s, but was repaired starting in 1845.