Conan O’Brien and Jon Stewart used the opening segments on their late-night shows Wednesday night to address the murders at the offices of the French satirical magazine Charlie Hebdo, which had taken place earlier in the day.

They saluted the work of the satirists and noted the importance of being able to criticize important figures and cultures through humor, according to the Boston Herald.

In an apparent terrorist attack, 12 staffers at the headquarters of Charlie Hebdo were gunned down in Paris by men wearing hoods who shouted Islamic phrases such as “allahu akbar” and “the prophet is avenged.”

It was the latest in an attack on the entertainment industry for criticizing a regime or culture, after the movie comedy “The Interview” that depicted the assassination of North Korea’s leader was put on ice due to theaters refusing to show it out of fear that they would be targeted for attack.

Jon Stewart struggled to find words to address the situation during Comedy Central’s “The Daily Show,” noting that his heart is with the staff of CHarlie Hebdo and their families, and “we know very few people who go into comedy as an act of courage.”

He said the goal wasn’t to make sense of the tragedy, because “there is no sense to be made of it,” but rather the goal was to keep going.

Conan O’Brien, meanwhile, said during his TBS late-night show that it was a “terribly tragedy” where 12 people were killed for making jokes that another group found offensive, which “really hits home for anyone” who often mocks political, social, and religious figures, he said.

However, other late-night figures ignored the tragedy. Neither Jimmy Fallon on NBC or David Letterman on CBS talked about the tragedy in opening segments.