Mr Durov, 39, was released on bail yesterday after four days of questioning following his arrest at Le Bourget airport outside Paris on Saturday.
The Telegram chief executive was released under judicial supervision on the condition that he paid a €5m deposit, reports twice a week to the police and does not leave the country.
Paris prosecutor Laure Beccuau said in a statement the judge found there were grounds to formally investigate Mr Durov on all the charges for which he was initially arrested four days ago.
They include suspected complicity in running an online platform that allows illicit transactions, images of child sex abuse, drug trafficking and fraud, as well as the refusal to communicate information to authorities, money laundering and providing cryptographic services to criminals.
Being placed under formal investigation in France does not imply guilt or necessarily lead to trial, but indicates judges consider there is enough evidence to proceed with the probe. Investigations can last years before being sent to trial or shelved.
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Carse justifies England faith as the archetypal bold pick
If you won a boxing match after your opponent continually punched themselves in the face, how much credit can you take?
Tenacious Diallo the key to Amorim pressing machine
Old Trafford has not seen anything like this before.
Gold King Cole packs the Bridge with merry old souls
In the 83rd minute, the ball rolled to the feet of Cole Palmer in a bubble of space outside Aston Villa's box, and the crowd snapped to attention.
Vibrant Anfield marks the changing of the Guardiola
There was a lull in the noise, a break in the Anfield atmosphere, when a defiant chant emerged from a corner near Stefan Ortega’s goal.
What is so daunting about Spain's new data checks?
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Sectarian clashes claim at least 130 lives in Pakistan
At least 130 people were killed in deadly sectarian clashes in Pakistan's northwestern Kurram district in spite of a tentative ceasefire, days after gunmen opened fire on a convoy of vehicles carrying Shia Muslims, local officials said.
Coalition government likely in Ireland as count proceeds
Fianna Fail say decisions on power-sharing for another day’
How Syria's forgotten war is back on the world's agenda
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Assad regime scrambles to halt Syrian rebels’ advance
Civilians reportedly killed by Russian and Syrian airstrikes
Mother of poisoning victim says she knew she would die
Lawyer Simone White succumbed to the effects of methanol while backpacking in Laos with two of her childhood friends
