Pavel Durov, the billionaire co-founder and CEO of the messaging app Telegram was arrested at Bourget airport outside Paris Saturday night, according to TF1 televisionciting an anonymous source.

According to the report, Durov, 39, was traveling aboard his private jet after arriving from Azerbaijan, which led to a search warrant issued by the French judicial police’s OFMIN because he was on a criminal investigation file (FPR).

Telegram offers end-to-end encrypted messaging – and allows users to set up “channels” to quickly spread information to followers.

“He made a blunder tonight. We don’t know why… Was this flight just a stopover? Either way, he’s stuck!” a source close to the investigation told the news outlet (translated by Google).

Durav was detained by the National Anti-Fraud Office (ONAF) on suspicion of facilitating various crimes, including terrorism, drug trafficking and fraud.

Read more: Billionaire Telegram CEO Pavel Durov Arrested in France – Is the War on Free Speech Escalating?