ISIS has claimed responsibility for an attack at a popular concert venue complex near Moscow Friday that left dozens dead and more than 100 wounded after assailants stormed the venue with guns and incendiary devices. The terror group took responsibility for the attack in a short statement published by ISIS-affiliated news agency Amaq on Telegram on Friday. The group did not provide evidence to support the claim. CNN military analyst and retired Gen. Wesley Clark and former CNN Moscow bureau chief Jill Dougherty join Erin Burnett to discuss. #CNN #News