Authorities in two Russian regions have blocked the Telegram messenger because of concerns that the app could be used by enemies, a regional digital development minister was quoted as saying by the TASS state news agency on Saturday.

Dagestan and Chechnya are mainly Muslim regions in southern Russia where intelligence services have registered an increase in militant Islamist activity.

“It (Telegram) is often used by enemies, an example of which is the riots at the Makhachkala airport,” said Yuri Gamzatov, Dagestan’s digital development minister, adding that the decision to block the messenger had been made at the federal level.