Telegram messaging app CEO arrested in France

TF1 and BFM both said the investigation was focused on a lack of moderators on Telegram, and that police considered that this situation allowed criminal activity to go on undeterred on the messaging app.

Telegram did not immediately respond to a Reuters request for comment. The French Interior Ministry and police had no comment.

TF1 said Durov had been travelling from Azerbaidjan and was arrested about 8pm on Saturday.

Telegram, based in Dubai, was founded by Russian-born Durov, who left Russia in 2014 after he refused to comply with demands to shut down opposition communities on his VK social media platform, which he sold.

Durov, who is estimated by Forbes to have a fortune of $US15.5 billion ($A22.8 billion), said some governments had sought to pressure him but the app, which has 900 million active users, should remain a "neutral platform" and not a "player in geopolitics".