A spokesman for the terrorist group "Islamic State" praised the attack on the concert hall in Moscow suburbs on March 22, which killed more than 140 people, Reuters and BTA reported.
The speaker's statement was pre-recorded and published on the channel of the "Islamic State" in "Telegram".
On March 22, gunmen attacked the audience before a concert at the "Crocus City Hall".
The number of injured in this attack is over 300.
After the attack, Russia detained 11 people, 4 of whom are believed to be the direct perpetrators.
Eight of those arrested were sent to pre-trial detention, writes BTA.