“Paris police have charged a French suspect with planning a terror attack, citing messages sent with the secure-messaging Telegram app.
‘We were able to detect them, detect this attack plan and were able to arrest them,’ French Interior Minister Gerard Collomb told BFM TV. He said two suspects were ‘preparing to commit an attack, with either explosives or ricin, this very powerful poison.’ Only one was charged, a 20-year-old illegal immigrant of Egyptian origin, while the other was released.”
Source: Is Telegram Secure? French Terror Arrest Raises New Questions About Messaging App – Defense One