In August 2016 , French anti-terrorism investigators asserted that the two ISIS-directed Jihadists who fatally cut the throat of a priest in Saint-Étienne-du-Rouvray in Normandy , France , and videoed the murder , had communicated via Telegram and " used the app to coordinate their plans for the attack " . ISIS 's media wing subsequently posted a video on Telegram , showing the pair pledging allegiance . A CNN news report stated that Telegram had " become known as a preferred means of communication for the terror group ISIS and was used by the ISIS cell that plotted the Paris terror attacks in November "
Paris terror attacks in November
November 2015 Paris attacks
Telegram (software)