FOX NEWS -- RFK Jr., Elon Musk and more reacted to the news that Telegram messaging app CEO Pavel Durov was arrested in France by speaking out in support of free speech on social media. 

"The need to protect free speech has never been more urgent," RFK Jr. wrote on X, reacting to the news, just days after he endorsed former President Trump.

Billionaire and Telegram messaging app CEO Pavel Durov was arrested in Paris on Saturday night, according to TF1 TV and BFM TV, Reuters reported. According to TF1, Durov was served an arrest warrant in relation to a preliminary police investigation.

The investigation regards his company's messaging app, as French police believe there are not enough moderators to keep criminal activity in check, TF1 reported.

Musk, who also posted "#FreePavel" to social media following the reports, called out the arrest in multiple posts. 

Musk tweeted on his personal X account: "POV: It’s 2030 in Europe and you’re being executed for liking a meme"

Others suggested it would lead to larger implications and that governments would go after Musk and X next. 

"They're going after Telegram so they have a pretext to go after X and Elon next," Joey Mannarino wrote.