- What we know about the Moscow concert hall attackBusiness Insider
- Putin says gunmen who raided Moscow concert hall tried to escape to Ukraine. Kyiv denies involvementThe Associated Press
- ISIS Shares Video Of Gunmen Carrying Out Deadly Moscow Concert AttackNDTV
- Islamic State releases photo of alleged attackers in Russia shootingReuters
- Kyiv rebuffs Putin’s claim gunmen who killed 133 Russians had Ukraine linkBusiness Insider