The so-called Islamic State extremist militia has published video of Friday’s terrorist attack at a concert hall on the outskirts of Moscow. The extremist group’s Amaq mouthpiece published an almost 90-second video on Sunday, which is said to show the attackers at the scene of the attack. The Arabic subtitles state that Amak shows “exclusive scenes” of the “bloody attacks on Christians.” At the beginning, a heavily armed man with an assault rifle is seen firing into a corridor where many lifeless bodies are already lying on the floor. The camera then pans to one of the suspected terrorists, wh…