Terrorist in Russia most actively use the Telegram messenger, the PR Department of Russia's intelligence service FSB said.
"The FSB during the searches to reveal secret groups of international terrorist organizations fixes a total use by their members of the Internet-based messengers in their secret communication between themselves and with the foreign curators," TASS cited the statement as saying.
"Most actively, members of international terrorist organizations in the territory of the Russian Federation are using the Telegram messenger, which allows the terrorists having chats with a high level of encrypted information," the service added.
The FSB added that the Telegram messenger was used by the terrorist and plotters of the terrorist attack in St. Petersburg's metro in April.
